Stachytarpheta jamaicensis
 
Common Names Blue Porterweed, Jamaica Vervain, Light-blue Snakeweed
 
Zones 9A–11
 
A low-growing, sprawling wildflower native to South Florida, the Caribbean, and tropical America, Stachytarpheta jamaicensis is a powerhouse pollinator plant. Its vivid blue flowers bloom nearly year-round, attracting butterflies, hummingbirds, and native bees. Often used as a groundcover in coastal gardens and restoration sites, it tolerates drought, sandy soils, and salt wind, making it ideal for sunny, low-maintenance landscapes.
 
Key Features
Growth Habit: Sprawling groundcover; semi-woody stems; horizontal spread
Height: Typically 1–2 ft (30–60 cm); spread 2–3 ft
Leaves: Opposite or subopposite; ovate with serrated margins; dark green; 1–4 in long
Stems: Green to purple; woody with age; many arise from base
Flowers: Small blue to violet with white centers; bloom daily on 8–16 in spikes; peak in summer/fall
Fruit: Seeds retained in dried spikes; self-seeding common
Ecology: Nectar source for Monarch (Danaus plexippus), Gulf Fritillary (Agraulis vanillae), Clouded Skipper (Lerema accius), and Tropical Buckeye (Junonia evarete); attracts hummingbirds and native bees
 
Growing Conditions
Light: Full sun to light shade; poor bloom in dense shade
Watering: Low; drought tolerant once established
Soil: Sandy or limestone-based; well-drained; tolerates compaction
Temperature: Sensitive below 30°F (–1°C); protect from frost
Humidity: High tolerance; thrives in coastal humidity
Propagation: Seed or softwood cuttings; allow spikes to dry before harvesting
Tolerance: Salt wind, light foot traffic, seasonal drought
 
Landscape Use Ideal for butterfly gardens, coastal restorations, and sunny native beds. Use as a groundcover, border plant, or mass planting. Pairs well with Gaillardia pulchella, Zamia integrifolia, and Lantana depressa.