Catalog 01: Wetlands & Bayous | Urban Green Initiative

Site Type

Wetlands & Bayous

Bayou margins, retention pond edges, and flood-prone bottomland sites along Houston's waterway network.

This catalog is designed using the Houston Miyawaki Forest Design Guide species selection criteria — all species validated for Houston's USDA zones 9a–10a and the specific site conditions of this catalog type.

Site Specifications

Planting Density 3.5 plants/sq meter (~325 plants per 1,000 sf)

Planting Window October–March

Self-Sustaining By Month 24–30

USDA Zones 9a–10a (Houston)

Species Composition

Recommended species mix

All species are native to the Houston region and validated for this site type. Percentages represent target proportions of total planting count.

22%

Emergent

30%

Sub-Canopy

30%

Shrub

18%

Ground Cover

Common Name	Scientific Name	Layer	% Mix	Notes
Bald Cypress	Taxodium distichum	Emergent	12%	Signature bayou tree; exceptional stormwater retention; tolerates periodic inundation
Water Oak	Quercus nigra	Emergent	10%	Common bottomland oak along Buffalo and Brays Bayou; restrict to acid soils
Sweetbay Magnolia	Magnolia virginiana	Sub-Canopy	12%	Fragrant white flowers May–September; tolerates wet soils and periodic flooding
Possumhaw Holly	Ilex decidua	Sub-Canopy	10%	Brilliant orange-red winter berries; primary food source for migrating songbirds
Yaupon Holly	Ilex vomitoria	Sub-Canopy	8%	Extremely adaptable evergreen; thrives in wet or dry soils; 40+ bird species
Buttonbush	Cephalanthus occidentalis	Shrub	12%	Wetland specialist tolerating standing water; outstanding butterfly and bee attractor
Virginia Sweetspire	Itea virginica	Shrub	10%	Fragrant white flower spikes; brilliant fall color; tolerates wet, boggy conditions
Elderberry	Sambucus canadensis	Shrub	8%	120+ bird species consume the fruit; thrives in moist, fertile bayou-margin soils
Cherokee Sedge	Carex cherokeensis	Ground Cover	10%	Shade-tolerant sedge stabilizing moist, clay-rich forest floors
Purple Meadow Rue	Thalictrum dasycarpum	Ground Cover	8%	Feathery foliage and airy flower clusters for moist bottomland and bayou-edge sites

Site-Specific Guidance

Key considerations for this site type.

💧

Hydrology First

Map seasonal flood patterns before planting. Species placement must account for varying inundation depths — Bald Cypress tolerates permanent saturation while Virginia Sweetspire prefers elevated edges.

🦅

Wildlife Corridor Value

Bayou-adjacent forests provide critical flyway habitat. Native berry producers (Possumhaw, Yaupon, Elderberry) should represent at least 30% of planting to maximize migratory bird value.

🌊

Erosion Stabilization

Plant Virginia Sweetspire and Buttonbush densely on actively eroding banks — their root systems stabilize 2–3 feet of soil depth. Priority placement within 10 feet of water edge.

🦟

Mosquito Mitigation

Dense canopy over standing water reduces mosquito breeding habitat by 60–70%. Prioritize rapid canopy closure through tight Possumhaw and Yaupon Holly spacing.