Introduction
Porterweed 'Giant Purple' (Stachytarpheta mutabilis 'Giant Purple') is a vigorous tropical perennial producing long, arching spikes of deep purple flowers nearly year-round. It is an easy warm-season plant that thrives in Florida's heat and humidity and is one of the top butterfly and hummingbird attractors available. Available in a #1 container.
Growing conditions
- Light: Full sun to partial shade; best flowering in full sun.
- Water: Low to moderate; drought-tolerant once established.
- Soil: Well-draining soil; tolerates poor, sandy soils.
- Fertilizer: Little to no fertilizer needed; excess fertilizer reduces flowering.
- Season: Tropical perennial; blooms nearly year-round in South Florida; protect from frost in North Florida.
Planting tips
Plant in a sunny, well-drained location. Excellent for butterfly gardens, borders, and tropical landscapes. Prune lightly to encourage bushier growth and more blooms. One of the most important butterfly nectar plants for Florida, especially for swallowtails and hummingbirds.
Troubleshooting
Frost damage
Foliage dies back in freezing temperatures. Cut back damaged growth in spring; roots typically survive and resprout.
Root rot
Overwatering or poor drainage. Reduce watering and ensure soil drains freely.
Leggy growth
Insufficient light. Move to a sunnier location and prune back to encourage compact growth.
Pet safety
Porterweed is non-toxic to pets and is generally considered safe around dogs and cats.
Quick care summary
Difficulty: Easy. Light: Full sun to partial shade. Watering: Low to moderate, drought-tolerant once established. Humidity: Low to moderate. Pet safety: Non-toxic.
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