Overview
Alligator flag is a large Florida native wetland perennial with tall stems, broad paddle-shaped leaves, and purple flower clusters.
Mature Size and Habit
Established clumps commonly reach 6 to 10 feet tall and spread through thick rhizomes. Allow room for expansion and access for periodic thinning.
Best Landscape Uses
Use it in rain gardens, bioswales, pond margins, wet ditches, and consistently moist low areas.
Sunlight
Full sun or partial sun works well. Flowering is strongest with abundant light.
Soil, Drainage, and Irrigation
This plant prefers saturated soil, shallow water, or a consistently moist bed. It performs poorly in dry, fast-draining locations.
Best Planting Season for Tampa and Central Florida
Plant during spring or early summer when warm soil and seasonal rainfall support rapid establishment.
Pruning and Maintenance
Cut damaged or winter-browned stems near the base. Thin rhizomes when the colony exceeds its intended area.
Wildlife Value
Dense clumps provide shelter and structure for wetland wildlife. Flowers support pollinating insects.
Cold and Heat Sensitivity
Heat is not a concern when roots stay wet. Drought causes rapid decline. Hard freezes may brown top growth.
Safety, Roots, and Placement Warnings
No major toxicity or thorn issue is known. Spreading rhizomes require containment in small designed basins. Tall growth may block visibility.
Invasive Concerns
It is native to Florida. Manage its natural spreading habit so it stays within the designed wet area.
Helpful Resources
UF/IFAS aquatic plant directory and Florida Native Plant Society profile
Local Delivery
Local delivery only in approved South Tampa ZIP codes. $600.00 minimum plant order. $100.00 flat delivery fee. Ecoscape will contact you to schedule delivery.