At a glance
- Region ID: GULF-COAST
- Anchor cities: Houston, New Orleans, Mobile, Pensacola
- USDA Hardiness Zones: 8b–9b
- Soil: Coastal sand, alluvial Mississippi delta, prairie clay (Houston)
- Catalog size: 100 plants
- Climate factors: Humidity, salt spray near coast, hurricane wind exposure, occasional hard freezes
Pruning & maintenance calendar
Anchored to plants with full care profiles. Generated from per-plant data in our public catalog.
January – Mid-February
Structural pruning of crape myrtle before bud break. Bark scale inspection at branch crotches and trunk.
January – March
Post-bloom pruning of sasanqua camellia after winter bloom flush ends. Annual cutback of Asiatic jasmine groundcover before new growth.
February – March
April – Early May
Post-bloom pruning of Indian hawthorn, Loropetalum, and Sasanqua. Sasanqua tea scale inspection.
May – June
Daylily division and reblooming cultivar deadheading. Avoid live oak pruning February through June in Texas oak wilt counties — vectors active.
July – Late August
St. Augustinegrass mowing height monitoring — maintain 3.5–4 inches. Chinch bug inspection at sunny patch margins.
September – November
Hurricane prep — structural cuts on live oak, Southern magnolia after vector season ends. Pre-storm canopy thinning where appropriate.
Regional pest & pathogen pressure
- Crape myrtle bark scale — established and spreading. Tell: white felt-like crusty patches on branches and trunk, black sooty mold on lower leaves.
- Lace bug on azalea and lantana — heavy summer pressure. Tell: stippled bleached foliage with black tar-like fecal spots on leaf undersides.
- Entomosporium leaf spot on Indian hawthorn — has reduced the species' use dramatically. Tell: reddish-purple spots progressing to brown blotches, significant leaf drop by late summer.
- Camellia tea scale — chronic on sasanqua and japonica. Tell: white-and-brown elongated scales on leaf undersides, yellow blotches on the top side above colonies.
- Oak wilt in Texas portion of region — pruning timing critical. Tell: yellow then brown banding along leaf midribs on live oak; root-to-root spread through interconnected oak motts.
- Camellia petal blight — sudden bloom collapse in cool wet springs. Sanitation of fallen petals is the only cultural control.
- Algal leaf spot — common on magnolia, camellia in humid conditions. Cosmetic.
- Chinch bug on St. Augustinegrass — heavy mid-summer in sunny lawns. Tell: expanding yellow-to-brown patches; tiny black-and-white bugs visible at patch margins.
- Sooty mold following honeydew from scale, aphid, whitefly — diagnostic of an insect issue above, not a primary disease.
Core staples (commonness 1)
Currently: 11 of 18 core staples profiled. Remaining plants tracked in the catalog data with care notes pending.
Live Oak
Core staplePruning — late summer or fall (outside oak wilt vector period)
In Texas oak wilt counties, avoid pruning February through June when vector beetles are active. Industry standard is to paint or seal cuts on live oak immediately — this is one of the few species where wound sealants are actively recommended. Outside oak wilt regions, standard tree pruning practice applies.
Cultural notes
Iconic Southern tree, salt-tolerant, drought-tolerant once established, and wind-resistant — survives hurricanes when other trees fail. Massive spread at maturity (up to 80–100 ft. across); planting close to structures is a long-term mistake. Surface roots are extensive and damage adjacent hardscape. Evergreen in coastal regions but drops and replaces leaves annually in March-April.
Common pests & pathogens
Disease Oak wilt (Texas range)
Vascular wilt; live oak uniquely susceptible because root grafts between adjacent trees transmit the pathogen below ground. Diagnostic: browning and leaf drop from outer canopy inward, yellow-then-brown bands along leaf midribs, root-to-root spread through oak motts.
Pest Buck moth caterpillar
Black spiny caterpillars feeding in groups in late spring. Stinging spines cause significant skin reaction on contact — a public-safety concern in residential and school landscapes during outbreak years.
Pest Gall wasps
Numerous types — bullet galls, wool galls, leaf galls, twig galls. Cosmetic primarily; even heavy gall loads rarely affect tree health.
Crape Myrtle
Core staplePruning — late winter, before bud break
Never top — known regionally as crape murder. Cut back to lateral branches at the trunk or to outward-facing buds. National Arboretum "Indian Tribes" series (Natchez, Tuscarora, Miami, Tonto) bred for mildew resistance.
Common pests & pathogens
Pest Crape myrtle bark scale
White felt-like crusty patches on branches and trunk, especially in branch crotches. Black sooty mold on lower leaves and beneath canopy. Established and spreading throughout Southeast and Gulf Coast. First US detection 2004 in Texas.
Disease Powdery mildew
White powdery coating on new growth, flower buds, and stem tips. Pressure heaviest in humid summers and shaded sites.
Southern Magnolia
Core staplePruning — minimal; light shaping late winter/early spring
Resents heavy pruning — natural pyramidal form is the strongest structural form. Limbing up creates a permanent gap. Leaves drop continuously throughout the year, alarming new clients unfamiliar with the species.
Cultural notes
Iconic Southern tree, fragrant blooms in late spring and early summer. Little Gem is the compact cultivar most often planted in residential settings. D.D. Blanchard and Bracken's Brown Beauty offer bronze leaf undersides for ornamental contrast.
Common pests & pathogens
Pest Magnolia scale
Large soft brown or pinkish scales on twigs and undersides of branches — among the largest scale insects in the landscape, up to 1/2 inch across. Heavy honeydew and sooty mold below.
Disease Algal leaf spot
Round, raised, velvety green-to-orange spots on leaf surfaces. Heavy in humid Gulf Coast conditions. Cosmetic primarily.
Lantana
Core staplePruning — late winter or early spring (cut back to 6–12 inches)
In zones 9+ where lantana overwinters as perennial, hard prune annually to control size and renew bloom. Sterile cultivars (New Gold, Bloomify series) increasingly specified due to invasive concerns.
Toxicity: All parts of the plant are toxic if ingested. Berries are particularly attractive to children and dogs.
Common pests
Pest Lantana lace bug
Stippled, bleached, brown-spotted foliage from feeding on undersides of leaves. Black tar-like fecal spots on leaf undersides are diagnostic. Heavy infestations defoliate and suppress bloom mid-to-late summer.
Pest Whitefly
Small white insects flying up in clouds when foliage disturbed. Honeydew and sooty mold on lower leaves.
Indian Hawthorn
Core staplePruning — immediately after spring bloom
Resents heavy formal shearing — natural rounded form is the design intent and the structurally strongest form. Repeated tight shearing increases entomosporium pressure significantly.
Common pathogens
Disease Entomosporium leaf spot
Reddish-purple spots progressing to large brown blotches and significant leaf drop. Defoliates plants by late summer in heavy years. Pressure heavily correlated with overhead irrigation and sheared-canopy plantings. The defining disease pressure on Indian hawthorn in the Gulf Coast — has dramatically reduced the species' use in commercial installs. Resistant cultivars (Eleanor Taber, Snow White, Olivia) selected through university breeding programs offer significantly reduced pressure.
Disease Fire blight
Sudden blackening and "burned" appearance of new shoot tips and flower clusters. Affected tips curl into a shepherd's crook shape.
Oleander
Core staplePruning — late winter to early spring
Always wear gloves when pruning oleander — sap is severely toxic and can cause skin irritation. Do not burn pruning debris; smoke is toxic. Bag and dispose of clippings rather than chipping or composting.
Severe toxicity: All parts of the plant are severely toxic if ingested — to humans, pets, and livestock. A single leaf can be fatal to a child. Professional practice avoids siting in playgrounds, school grounds, near livestock fencing, and in residential yards with small children or pets.
Common pests & pathogens
Pest Oleander caterpillar
Bright orange caterpillars with black tufts, feeding in groups. Skeletonize foliage rapidly during outbreaks. Pressure heavy in Florida and Gulf Coast.
Pest Oleander aphid
Bright yellow aphids in dense clusters on new growth and flower buds. The bright yellow color is diagnostic. Cosmetic primarily.
Disease Oleander leaf scorch (Xylella)
Browning and necrosis of leaf margins, progressing inward; entire leaves turn brown and drop. Bacterial disease spread by sharpshooter insect vectors. Present and pressure increasing in the Gulf Coast region.
Sasanqua Camellia
Core staplePruning — immediately after bloom (January–March)
Sasanqua blooms fall through winter (October–February), distinguishing it from C. japonica which blooms late winter through spring. Light selective pruning preferred; resents heavy shearing.
Cultural notes
Prefers acidic soil (pH 5.5–6.5), filtered shade or morning sun with afternoon shade. Sasanqua tolerates more sun than japonica. Chlorosis signals alkaline soil. Shibori Egao, Yuletide, Setsugekka are trade-standard cultivars.
Common pests & pathogens
Pest Tea scale
White-and-brown elongated scales clustered on undersides of leaves; affected leaves develop yellow blotches above the colonies. Severe infestations defoliate plants.
Disease Camellia petal blight
Sudden browning and soft-rot of flower petals; collapse within 24–48 hours. Caused by Ciborinia camelliae fungus that overwinters in fallen petals. Sanitation (removal of fallen petals) is the only cultural control. Affects bloom display only; plant health unaffected.
Chinese Fringe Flower (Loropetalum)
Core staplePruning — immediately after spring bloom (April–May)
Frequently planted under windows without regard for mature size — species form reaches 10–15 ft. Dwarf cultivars (Purple Pixie, Crimson Fire, Purple Diamond) hold 3–5 ft. Right-sizing the cultivar to the site prevents annual hard-prune-to-control-size cycles.
Cultural notes
Workhorse purple-foliage evergreen across the Southeast. Tolerates full sun in the South. Acidic soil preferred — chlorosis in alkaline soils common.
Liriope
Core staplePruning — late winter (February–early March)
Mow or string-trim entire planting to 2–3 inches above the crown once a year before new growth pushes. Anthracnose pressure higher in irrigation-heavy plantings.
Asiatic Jasmine
Core staplePruning — late winter to early spring
Mow or string-trim entire bed to 2–3 inches once a year. Mature beds spread aggressively and require edge maintenance. Rarely flowers in cultivation — distinct from Confederate jasmine (T. jasminoides) despite similar common names.
Dwarf Yaupon Holly
Core staplePruning — late winter to early spring
Schillings, Stokes, Nana cultivars hold tight rounded form. Workhorse foundation evergreen and the reliable alternative to Japanese holly where boxwood blight is a concern. Native to the Southeast.
Inside the app
Skip the spreadsheet. Verdant Meridian seeds your library with the regional palette on day one.
Pick your region at onboarding — the app loads commonness-1 and commonness-2 plants into your element library.
Try Free — 30 DaysHow this list was built
Compiled from regional wholesale grower availability lists — not retail garden references. No chemical, fungicide, or product recommendations appear anywhere in this database. Diagnostic and cultural information only.
FAQ
When should I prune crape myrtle in Houston or New Orleans?
Late winter, January through mid-February, before bud break. Never top. Bark scale pressure is heavy throughout the Gulf Coast — inspect trunk and branch crotches before pruning.
Is live oak safe to prune year-round on the Gulf Coast?
In Texas oak wilt regions, no — avoid pruning February through June when vector beetles are active. Outside oak wilt counties, late summer or fall is preferred. Always seal cuts on live oak immediately.
Is oleander really that toxic?
Yes. All parts severely toxic if ingested. A single leaf can be fatal to a child. Smoke from burning clippings is also toxic. Professional practice avoids playgrounds, schools, livestock fencing, and yards with small children or pets.
Why is Indian hawthorn declining in Gulf Coast plantings?
Entomosporium leaf spot. Humid conditions and overhead irrigation favor the disease. Resistant cultivars (Eleanor Taber, Snow White, Olivia) and Distylium substitutions are increasingly specified.
Cite this page
Verdant Meridian, “Gulf Coast & Deep South Plant Palette,”
verdantmeridian.app/regions/gulf-coast, updated May 2026. CC-BY-4.0. Raw data: /data/plants.json.Published under CC-BY-4.0. Free to use, redistribute, build on — attribution required.
