Drought Tolerant Plants for Zone 9: Sun, Shade and Trees
Drought tolerant plants for zone 9 only earn that label after their roots have grown out of the nursery pot and into your soil. Planted in October and watered on a schedule, a Texas sage, a rosemary or a desert willow can live on rainfall alone, or on one deep soak a month, by its second or third summer. Planted in May and left alone because the tag said drought tolerant, the same plant is usually dead by July. The tag describes the mature plant. The first one to three seasons are your job, and this page covers that job: how much to water while roots establish, how to taper off, and how little each group of plants needs once the dry season arrives.
Get the units right first. Our watering guide converts inches of water into gallons and run times for your beds, which is the language every schedule below is written in.
Updated September 2026
Drought tolerant plants for zone 9 depend on which zone 9 you live in
Zone 9 is a winter temperature band, with average coldest nights between 20 and 30°F. It says nothing at all about rain, and four very different climates share the number.
| Zone 9 region | Annual rain, roughly | When the dry season falls | What drought tolerant has to mean there |
|---|---|---|---|
| California inland valleys and the Central Valley | 10 to 30 in | May through October, often with no measurable rain at all | Survives five or six rainless months, and does not rot when a neighbor's sprinkler hits it |
| Low desert Southwest, around Tucson and the edges of the Phoenix and Las Vegas basins | 4 to 12 in | April through June is the harshest stretch, before summer monsoon storms | Survives extreme heat, reflected heat off walls and alkaline soil on very little water |
| Central and South Texas, and the Gulf Coast from Houston to New Orleans | 30 to 65 in | Irregular. Flash droughts in July and August that can run for months | Survives a hot rainless stretch in heavy clay or thin limestone soil, then survives a week of downpours |
| North and central Florida | 45 to 55 in | Roughly November through May, with April and May the hottest and driest | Survives spring drought in sand that holds very little water, then a humid, rainy summer |
The practical consequence is that a plant sold as drought tolerant in Sacramento can fail in Houston for the opposite reason. Lavender, rockrose, manzanita and ceanothus evolved with dry summers, and in Gulf Coast humidity and clay they die of root rot, not thirst. Plants from Texas and northern Mexico, such as Texas sage, autumn sage and the muhly grasses, handle both kinds of dry. Florida sand is its own case: water drains past a new root ball in hours, so even tough natives need more frequent watering while they establish.
This page assumes you have already confirmed a plant survives your winter. The hardiness ranges live on our perennials by zone and shrubs by zone pages, and they are not repeated here. Everything below is about water.
Establishment watering: the first season decides everything
A nursery plant arrives with its roots packed into a ball of bark or peat based potting mix. That mix dries far faster than the native soil around it, and for the first several weeks the plant can only drink from inside the ball. The surrounding bed can be damp while the root ball is bone dry, which is why a new shrub wilts two days after a soaking rain. Water the root ball itself first, then widen the wetted area as roots move out.
How long establishment takes
| Plant type | Typical nursery size | Establishment period in zone 9 | Sign it is done |
|---|---|---|---|
| Perennials, grasses, small succulents | 1 gallon | One growing season, about 3 to 6 months | New growth spreads past the original crown, no dawn wilt after a skipped watering |
| Small shrubs | 1 to 3 gallon | 6 months to 1 year | A full flush of new shoots, leaves stay firm through a hot week on the reduced schedule |
| Large shrubs | 5 to 15 gallon | 1 to 2 years | Roots found 12 inches or more outside the original root ball when you probe |
| Trees | 15 gallon, about 1 inch trunk | Roughly 6 months per inch of trunk diameter | Twig growth each season returns to normal length for the species |
| Larger trees | 2 to 4 inch trunk | 1 to 2 years, sometimes longer | Same as above. Bigger trees take proportionally longer |
| Palms | Field dug, any size | 4 to 6 months of regular water | A new spear leaf opens and the canopy stops yellowing |
Tree establishment estimates from warm climate extension research run from about 3 months per inch of trunk diameter in frost free zones to about 6 months per inch in zone 9. Plan on the long end. A 3 inch tree planted in fall needs regular water through at least one full summer and often into a second.
The schedule for warm, dry weather
The table below is for planting into dry, warm conditions. In the cool, rainy months of November through February, cut the frequency roughly in half, and skip any watering that follows a soaking rain of an inch or more.
| Time after planting | Perennials | Shrubs | Trees |
|---|---|---|---|
| Weeks 1 and 2 | Every 1 to 2 days, soaking the root ball | Every 1 to 2 days | Daily, 1.5 to 3 gallons per inch of trunk diameter |
| Weeks 3 to 8 | Twice a week | 2 to 3 times a week | Every other day |
| Months 3 and 4 | Once a week | Twice a week | 2 to 3 times a week |
| Months 5 and 6 | Every 10 days | Once a week | Once a week |
| Rest of the first year | Every 2 weeks in heat | Every 10 to 14 days in heat | Once a week until established |
| Second summer | Rain only for tough natives, otherwise every 2 to 3 weeks | Every 2 to 3 weeks | Every 1 to 2 weeks |
Two adjustments matter more than following the table exactly. In Florida sand, water a little more often and a little less at a time, because the soil cannot hold a big soak. In Texas clay, water less often and more slowly, because the soil holds water for days and a root ball sitting in saturated clay suffocates. Before every scheduled watering in the first month, push a finger or a long screwdriver 2 to 3 inches into the root ball itself. If it comes out damp, wait a day.
When to plant in zone 9
The best planting window across California, Arizona and Texas zone 9 is October through early December. The soil is still warm enough for roots to grow, the air is cool enough that leaves lose little water, and winter rain does part of the establishment work for you. Spring planting works, but a plant set out in March has only eight to ten weeks before summer heat arrives, and a plant set out in May in the low desert is being asked to root into 100°F soil.
Florida flips part of that. The dry season runs through spring, so a plant installed in April or May needs hand watering through the hottest, driest weeks of the year. Planting from October through February with irrigation, or at the start of the summer rains in June, takes much of that load off.
Planting details that save water for years
- Set the root ball level with the surrounding grade, or an inch or two above it in heavy clay. A plant that settles into a dip becomes the drain for the whole bed every time it rains.
- Backfill with the native soil you dug out. A hole in clay filled with rich compost holds water like a bathtub, and roots circle in the soft soil instead of moving into the real ground.
- Loosen the outside of the root ball. Slice or tease circling roots so they point outward. Potting mix that stays a tight cylinder in the ground is the most common reason a plant still needs babysitting in year two.
- Build a shallow basin a few inches high just outside the root ball for the first year, so each watering soaks down instead of running off. Widen it as the plant grows, and knock it down before the rainy season in Gulf Coast and Florida gardens so it does not hold water against the crown.
- Mulch 2 to 3 inches deep, kept a few inches back from stems and trunks. Our mulch guide covers which materials hold moisture without matting down. For succulents and desert perennials, mineral mulch works better than bark, and our page on landscaping ideas with rocks and stones covers gravel sizes and depths for exactly that kind of bed.
Tapering off: training a plant to survive the dry season
The goal of establishment watering is a deep root system, and the way to get one is to stretch the time between waterings while keeping each watering deep. Shallow, frequent water trains roots to stay in the top few inches, and those are the roots that cook in August.
A taper that works for most shrubs and perennials once the establishment period is over:
- Weekly deep soaks for the last month of the establishment period.
- Every 10 days for the next month.
- Every 2 weeks for a month, then every 3 weeks.
- Monthly, or rain only, depending on the plant tables below.
Test each step before taking the next one. During a hot, dry week, skip one scheduled watering and look at the plant at dawn. Leaves drooping in the late afternoon and firm again the next morning is a normal heat response. Leaves still drooping at sunrise means the plant is genuinely short of water, so go back one step and hold there another month.
Move the water as the roots move. Drip emitters sitting against the stem of a two year old shrub are watering roots that stopped doing most of the drinking long ago. By the second year, emitters belong out at the edge of the canopy. For a tree, the absorbing roots extend well past the drip line, so a ring of emitters or a soaker hose should move outward every year.
Do not cut a plant to rain only in its first summer, even a tough native. The second summer is the real test of establishment, and the first is still part of the job.
Drought tolerant perennials for zone 9: full sun
The summer water column assumes a rainless stretch in July or August and means one deep soak that wets the root zone 8 to 12 inches down. Rain only means an established plant needs nothing beyond normal rainfall in most years.
| Perennial | Summer water once established | Best zone 9 regions | Watch for |
|---|---|---|---|
| Autumn sage (Salvia greggii) | Every 2 to 3 weeks in heat | All but Florida, where humidity shortens its life | Grows woody and leggy with too much water. Shear lightly after each bloom flush |
| Mexican bush sage (Salvia leucantha) | Every 2 weeks | All four | Cut to the ground in late winter |
| Blackfoot daisy (Melampodium leucanthum) | Every 3 to 4 weeks | Desert, Texas | Rots in wet clay or in a lawn sprinkler zone. Needs sharp drainage |
| Damianita (Chrysactinia mexicana) | Monthly or less | Desert, Texas | Wants lean, gravelly soil and no fertilizer |
| Desert marigold (Baileya multiradiata) | Monthly or rain only | Desert | Short lived but reseeds. Extra water shortens its life further |
| Parry's penstemon and firecracker penstemon | Rain only to monthly | Desert, California | Short lived. Overwatering is the usual cause of early death |
| California fuchsia (Epilobium canum) | Rain only to monthly | California, desert | Looks rough by winter. Cut it back hard then |
| Gaura (Oenothera lindheimeri) | Every 2 to 3 weeks | Texas, California | Taproot handles drought, rich soil makes it flop |
| Yarrow (Achillea millefolium) | Every 2 to 3 weeks | California, Texas | Fades in humid Gulf summers in heavy soil |
| Spanish lavender (Lavandula stoechas) | Every 2 to 3 weeks | California | Rots in Gulf humidity and clay. A West Coast plant |
| Zexmenia (Wedelia acapulcensis var. hispida) | Every 2 to 3 weeks | Texas | Orange daisies all summer, tolerates reflected heat |
| Gulf muhly (Muhlenbergia capillaris) | Every 3 to 4 weeks, rain only in the East | All four | Pink fall plumes. Sulks in wet, rich beds |
| Red yucca (Hesperaloe parviflora) | Monthly or rain only | Desert, Texas, California | Close to indestructible once established. Hummingbird flowers |
| Agave, cold tolerant species | Rain only | Desert, California, Texas | Choose species rated for your 9a or 9b low. Needs perfect drainage |
| Dune sunflower (Helianthus debilis) | Rain only once established | Florida | Sprawling coastal native for pure sand |
| Blanket flower (Gaillardia pulchella) | Every 2 to 3 weeks or rain only | Florida, Texas | Short lived annual type that reseeds freely |
Most of the failures in that table come from too much water rather than too little. Blackfoot daisy, damianita, penstemon and desert marigold decline fastest when they share irrigation with thirstier plants, so give them their own valve, or hand water them on their own schedule.
Drought tolerant shade plants for zone 9
Dry shade is the hardest planting site in any zone 9 yard. Shade cuts evaporation, which helps, but the tree making the shade is taking most of the water. Plants under a live oak or a mature pine compete with thousands of feeder roots, so expect establishment to take a full season longer than the tables above suggest, and hand water through the first two summers. If you are not sure whether a bed counts as part shade or full shade, our guide to full sun vs partial shade shows how to count the direct sun hours.
| Plant | Light | Summer water once established | Best zone 9 regions | Notes |
|---|---|---|---|---|
| Cast iron plant (Aspidistra elatior) | Full to deep shade | Every 3 to 4 weeks | Texas, Gulf, Florida, California | Scorches in direct afternoon sun |
| Coontie (Zamia integrifolia) | Sun to shade | Rain only | Florida, Gulf | Slow native cycad. All parts toxic to pets |
| Turk's cap (Malvaviscus arborescens var. drummondii) | Part to full shade | Every 2 to 3 weeks | Texas, Gulf, Florida | Red hummingbird flowers from summer to frost |
| Cedar sage (Salvia roemeriana) | Dappled shade | Every 2 to 3 weeks | Texas | Small, reseeds gently under trees |
| American beautyberry (Callicarpa americana) | Part shade | Every 2 to 3 weeks | Texas, Gulf, Florida | Wilts dramatically in drought and recovers after one soak |
| Liriope (Liriope muscari) | Part to full shade | Every 2 to 3 weeks | Texas, Gulf, Florida | Tolerates tree root competition better than most edging plants |
| Hummingbird sage (Salvia spathacea) | Part to full shade | Rain only | California | Looks tired by late summer. That is normal dormancy, not thirst |
| Douglas iris (Iris douglasiana) | Part shade | Rain only to monthly | Coastal California | Needs more water inland than near the coast |
| Island alum root (Heuchera maxima) | Shade | Every 3 to 4 weeks | California | Large leaved coral bells for dry shade |
| Oregon grape (Berberis aquifolium) | Part to full shade | Every 3 to 4 weeks | California | Also sold as Mahonia. Yellow spring flowers, blue berries |
| Coffeeberry (Frangula californica) | Sun to part shade | Rain only once established | California | Evergreen shrub for a woodland edge |
The California oak rule. Coast live oak, valley oak and blue oak evolved with dry summers, and regular summer irrigation near the trunk encourages root rot and oak root fungus that can kill a century old tree. Keep all summer water well away from the trunk, at least 6 to 10 feet out, and plant the area under the canopy only with rain only natives such as hummingbird sage, coffeeberry and Douglas iris. No lawn, no drip line, no thirsty perennials against the trunk.
Drought tolerant shrubs for zone 9
Shrubs take longer to wean than perennials, and their deeper root systems pay that time back. Water shrubs to 12 to 18 inches deep, at the edge of the canopy rather than at the stem.
| Shrub | Mature size | Summer water once established | Best zone 9 regions | Notes |
|---|---|---|---|---|
| Texas sage, cenizo (Leucophyllum frutescens) | 5 to 8 x 4 to 6 ft | Monthly or rain only | Texas, desert | Blooms after rain. Regular irrigation kills it faster than drought |
| Rosemary, upright and trailing | 2 to 6 x 3 to 6 ft | Every 3 to 4 weeks | California, desert, Texas | Root rot in wet clay. Raise the bed on the Gulf Coast |
| Dwarf yaupon holly (Ilex vomitoria 'Nana') | 3 to 5 x 4 to 6 ft | Every 3 to 4 weeks | Texas, Gulf, Florida | Handles both wet spells and drought |
| Manzanita, garden types such as 'Howard McMinn' | 4 to 7 x 5 to 8 ft | Rain only, monthly at most | California | Summer water shortens the life of an established plant |
| California lilac (Ceanothus) | 3 to 10 ft, by cultivar | Rain only | California | Naturally short lived, and much shorter with summer irrigation |
| Toyon (Heteromeles arbutifolia) | 8 to 15 x 8 to 12 ft | Rain only to monthly | California | Red winter berries, fine for an informal screen |
| Coast rosemary (Westringia fruticosa) | 3 to 6 x 4 to 6 ft | Every 3 to 4 weeks | California | Damaged in hard 9a freezes. More reliable in 9b |
| Bottlebrush (Callistemon) | 6 to 10 x 6 to 10 ft | Every 3 weeks | All four | Tip damage in hard 9a freezes, recovers quickly |
| Pineapple guava (Acca sellowiana) | 8 to 15 x 8 to 12 ft | Every 3 to 4 weeks | California, Texas | Edible flower petals and fruit, dense evergreen screen |
| Firebush (Hamelia patens) | 5 to 10 x 4 to 6 ft | Every 2 to 3 weeks | Florida, Gulf | Freezes to the ground in 9a and returns from the roots |
| Simpson's stopper (Myrcianthes fragrans) | 10 to 15 x 6 to 10 ft | Rain only once established | Florida | Native evergreen hedge with fragrant white flowers |
| Globe mallow (Sphaeralcea ambigua) | 3 x 3 ft | Monthly | Desert, inland California | Orange cup flowers in spring. Cut back after bloom |
| Hopbush (Dodonaea viscosa) | 10 to 12 x 6 to 8 ft | Monthly | Desert | Fast desert screen that takes wind |
| Pomegranate, shrub forms | 6 to 12 x 6 to 10 ft | Every 3 weeks, more if you want fruit | All four | Survives drought easily, fruit splits after irregular water |
| Oleander (Nerium oleander) | 6 to 12 x 6 to 10 ft | Every 3 to 4 weeks | All four | Heat and drought proof. Every part is toxic |
Rosemary doubles as a kitchen herb, and our perennial herbs by zone guide covers it alongside lavender, thyme and sage, which share its dislike of wet clay.
Drought tolerant trees for zone 9
A tree is where establishment watering matters most and where it is most often cut short. A tree that looks fine in its first July can still be living almost entirely off the original root ball, and a skipped month in its second summer is enough to kill it. Water trees to 18 to 24 inches deep.
| Tree | Mature size | Summer water once established | Best zone 9 regions | Notes |
|---|---|---|---|---|
| Live oak (Quercus virginiana) | 40 to 60 x 60 to 100 ft | Rain only, deep soak in extreme drought | Texas, Gulf, Florida | In oak wilt areas of Texas, avoid pruning from February through June |
| Coast live oak (Quercus agrifolia) | 30 to 60 x 30 to 60 ft | Rain only, never near the trunk | California | Follow the oak rule above |
| Cedar elm (Ulmus crassifolia) | 50 to 70 x 40 to 60 ft | Rain only to monthly | Texas | Tough street tree for clay and limestone |
| Chinese pistache (Pistacia chinensis) | 30 to 40 x 30 to 35 ft | Monthly | Texas, California, desert | Reliable red fall color. Female trees drop fruit that seeds around |
| Desert willow (Chilopsis linearis) | 15 to 25 x 15 to 25 ft | Monthly or rain only | Desert, Texas, California | Overwatering makes it floppy and weak wooded |
| Palo verde, 'Desert Museum' | 20 to 30 x 20 to 30 ft | Every 3 to 4 weeks | Desert | Thornless hybrid. Extra water makes fast, brittle growth that fails in wind |
| Honey mesquite (Prosopis glandulosa) | 20 to 30 x 30 to 40 ft | Rain only to monthly | Texas, desert | Frequent shallow watering causes shallow roots and blow over |
| Texas mountain laurel (Dermatophyllum secundiflorum) | 10 to 15 x 8 to 10 ft | Rain only | Texas, desert | Slow. Grape scented spring flowers, poisonous seeds |
| Crape myrtle (Lagerstroemia) | 10 to 25 ft, by cultivar | Every 3 to 4 weeks | All four | Blooms less in a hard drought but rarely dies of one |
| Fruitless olive, such as 'Swan Hill' | 20 to 30 x 20 to 30 ft | Monthly | California, desert, Texas | Pollen free and fruit free forms for yards and patios |
| Western redbud (Cercis occidentalis) | 10 to 20 x 10 to 15 ft | Rain only | California | Magenta spring bloom, multi trunk habit |
| Texas redbud (Cercis canadensis var. texensis) | 15 to 20 x 15 to 20 ft | Every 3 to 4 weeks | Texas | Glossy leaves that handle heat better than eastern redbud |
| Strawberry tree (Arbutus unedo) | 15 to 25 x 15 to 20 ft | Monthly | California | Evergreen with red bark and fall flowers |
| Cabbage palm (Sabal palmetto) | 40 to 50 x 10 to 15 ft | Rain only once established | Florida, Gulf | Regular water for 4 to 6 months after planting, then almost none |
Crape myrtle is the most planted tree on that list, and its best known problem is not water at all. Our page on crape myrtle covers its deer resistance and the pruning habit that ruins its shape. For canopy trees where speed matters more than water use, our fast growing shade trees page covers growth rate and wind strength.
Dry season survival: watering an established zone 9 garden
Once plants are established, the rhythm changes from frequent to deep and rare. Each group needs its water delivered to a different depth and in a different place.
| Plant group | Wet the soil to | Where the water goes | Rough interval in a rainless summer |
|---|---|---|---|
| Succulents and desert perennials | 6 to 8 in | At and just beyond the crown | Every 3 to 6 weeks, or rain only |
| Other perennials and grasses | 8 to 12 in | Across the whole clump | Every 2 to 3 weeks |
| Shrubs | 12 to 18 in | At the canopy edge, not the stem | Every 3 to 4 weeks |
| Trees | 18 to 24 in | A ring from halfway out to past the drip line | Every 4 to 6 weeks |
| Palms | 18 to 24 in | A wide circle around the trunk base | Every 3 to 4 weeks |
Measure the depth, do not guess it. Run the drip line or soaker for an hour, wait an hour, then push a long screwdriver or soil probe into the ground. It slides easily through moist soil and stops at dry soil. That single test tells you how long your system really needs to run, and it is usually far longer than people expect. Run the numbers for sprinklers and drip with our watering guide, and set the clock with our page on the best time to run sprinklers, since early morning water loses the least to evaporation and wind.
Soil type changes the interval, not the depth. Sand holds roughly half an inch to an inch of available water per foot of soil, and loam holds about twice that, so a Florida sand bed needs water more often than a Texas clay bed to reach the same depth. Clay has the opposite problem: water arrives faster than it soaks in and runs off. Water clay in two or three short cycles half an hour apart so each one has time to sink.
Reading the plant:
| What you see | When | Most likely cause | What to do |
|---|---|---|---|
| Wilted leaves at 3 p.m., firm again by evening | Hot afternoons | Normal heat response | Nothing. Watering now trains shallow roots |
| Wilted leaves at dawn | Early morning | Real water shortage | Deep soak today, then shorten the interval one step |
| Yellow lower leaves, soil wet 3 inches down | Any season | Overwatering or poor drainage | Stop watering until the top 4 inches dry |
| Crisp brown leaf edges, dry soil | Midsummer | Chronic underwatering, or salt buildup in desert soils | One long, slow soak, then deeper waterings less often |
| A lavender or rosemary collapses after summer storms | Late summer | Root rot in wet, warm soil | Replace with a plant suited to humid summers |
| A tree drops leaves in July with dry soil 12 inches down | Summer | Drought stress | Slow soak across the whole root zone past the drip line |
Salt in desert water. Municipal and well water in the low desert carries dissolved salts that build up in the root zone under drip irrigation, and the result looks exactly like drought damage. Once or twice each summer, run a watering two to three times longer than normal to push those salts below the roots. Summer monsoon rain does the same job in a good year.
Before and during a heat wave. Water deeply the day before a forecast heat wave rather than in the middle of it, and skip fertilizer and pruning until it passes. Both push soft new growth, and soft growth is the first thing lost when water runs short.
Let summer dormant plants sleep. Many California natives, including hummingbird sage, California fuchsia and some buckwheats, go semi dormant and look tired by August. Watering them back to green is how they die. The same is true of a Texas sage that has dropped some leaves in a hard drought: it will leaf out after the next rain.
The ways drought tolerant plants die in zone 9
- Planted in late spring. Too little time to root before summer heat. Plant in fall wherever you can.
- Skipped establishment because the tag said drought tolerant. The tag is describing a plant three years older than the one in your hand.
- Planted inside a lawn sprinkler zone. Daily turf watering rots Texas sage, blackfoot daisy, penstemon, rosemary and every California native on this page. Give them their own valve or keep them outside the spray.
- Frequent shallow watering. A 5 minute daily run keeps roots in the top 3 inches, where they fry in August. Deep and rare is the rule.
- The wrong kind of drought tolerance. Mediterranean plants in the humid Gulf, or Gulf plants in the unwatered California summer. Match the plant to the dry season you actually have.
- Emitters left at the stem. Year three roots are feet away from where the drip line was laid on planting day.
- Gravel over bark, or bark over succulents. Organic mulch holds moisture against succulent crowns, and gravel poured over old bark mulch creates a soggy layer that feeds weeds. Pick one mulch for the bed and match it to the plants.
Starter palettes by region
- California inland valleys: manzanita, toyon, coffeeberry and ceanothus for structure, with Spanish lavender, California fuchsia, penstemon and yarrow in sun, and hummingbird sage and Douglas iris under trees. Western redbud, strawberry tree or fruitless olive for a small tree.
- Low desert: Texas sage, globe mallow, hopbush and red yucca for structure, with blackfoot daisy, desert marigold, damianita and agave on gravel. Palo verde, desert willow or mesquite for shade.
- Central Texas and the Gulf Coast: dwarf yaupon, Texas sage on raised or rocky ground, and pineapple guava, with autumn sage, zexmenia and Gulf muhly in sun and Turk's cap, cedar sage and cast iron plant in shade. Live oak or cedar elm for canopy, Texas redbud or Texas mountain laurel for a small tree.
- North and central Florida: Simpson's stopper, firebush and dwarf yaupon for structure, with dune sunflower, blanket flower and Gulf muhly in sand, and coontie and beautyberry in shade. Live oak or cabbage palm for height.
Frequently asked questions
How long do I need to water drought tolerant plants after planting?
Perennials need regular water for one growing season, about 3 to 6 months. Small shrubs need 6 months to a year, large shrubs 1 to 2 years, and trees roughly 6 months for every inch of trunk diameter in zone 9. Start with water every day or two for the first two weeks, then stretch the interval gradually while keeping each watering deep. The second summer after planting is the real test, so do not stop cold after the first.
What is the best time of year to plant drought tolerant plants in zone 9?
October through early December in California, the desert Southwest and Texas. Warm soil lets roots grow, cool air limits water loss, and winter rain helps with establishment. In Florida, where spring is the dry season, plant from October through February with irrigation or at the start of the summer rains in June, and avoid April and May unless you can water often.
Can drought tolerant plants be overwatered?
Yes, and it kills more of them than drought does. Texas sage, blackfoot daisy, penstemon, rosemary, lavender, manzanita and ceanothus all rot when kept moist in warm weather, especially in clay. The warning signs are yellowing lower leaves with wet soil a few inches down, and a sudden collapse after a rainy spell. Give these plants their own irrigation valve and keep them out of lawn sprinkler spray.
What drought tolerant plants grow in shade in zone 9?
Cast iron plant, liriope, Turk's cap, cedar sage and American beautyberry in Texas and along the Gulf, coontie in Florida, and hummingbird sage, Douglas iris, island alum root, Oregon grape and coffeeberry in California. All of them need extra water for the first two summers when planted under trees, because tree roots take most of the moisture in the bed.
How often should I water an established tree during a zone 9 drought?
Every 4 to 6 weeks in a rainless summer for most established trees, wetting the soil 18 to 24 inches deep in a wide ring that starts halfway out from the trunk and extends past the drip line. Native oaks in California are the exception and should get no summer water near the trunk at all. A slow soaker hose left running for several hours does this better than a sprinkler.
Do drought tolerant plants need mulch?
Most do, and it cuts water use noticeably. Use 2 to 3 inches of shredded bark, pine straw or wood chips around shrubs, trees and most perennials, kept a few inches back from stems. Succulents, agave, blackfoot daisy, damianita and other desert plants do better with gravel, which keeps their crowns dry. Avoid mixing the two in the same bed.
Are native plants automatically drought tolerant?
No. Native means adapted to the local climate, which includes that climate's rain. A Florida native adapted to wet summers and a California native adapted to dry ones both qualify as native, and each would fail in the other's garden. Natives from dry uplands, rocky slopes and deserts are the drought tolerant ones, and even they need establishment watering in their first year.
