Also known as Blue Porterweed · Blue Rat's Tail · Blue Snakeweed
Cayenne Porterweed (Stachytarpheta cayennensis) is a fast-growing shrub with vibrant purple-blue flower spikes, attracting butterflies and pollinators.
At-a-glance light, water, soil, and growing conditions from plant data
High
75% intensity
Full sun exposure is ideal for best flowering.
Moderate
50% intensity
Keep soil consistently moist but not waterlogged.
Well-drained
50% intensity
Moderate
50% intensity
Prefers warm temperatures, ideally between 18-25°C.
Moderate
50% intensity
Feed with a balanced liquid fertilizer during the growing season.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | No |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Cayenne Porterweed prefers consistently moist soil but can tolerate brief dry spells once established. Water thoroughly when the top 2-3 cm of soil feels dry.
Reduce watering in cooler months to prevent waterlogged roots. Good drainage is crucial to avoid root rot.
Prune Cayenne Porterweed to maintain shape and encourage bushier growth. Deadhead spent flower spikes regularly to promote continuous blooming.
For larger plants, heavy pruning in early spring can revitalize them and prevent them from becoming leggy. Aim for a rounded form.
Propagate Cayenne Porterweed easily from stem cuttings. Take 10-15 cm cuttings in spring or summer and dip the ends in rooting hormone. Plant them in moist, well-draining potting mix in a warm location.
Roots typically form within 3-4 weeks.
Repot Cayenne Porterweed when it becomes root-bound, typically every 2-3 years. Choose a pot that is one size larger than the current one. Use a well-draining potting mix.
Repot in early spring before the active growing season begins. Water thoroughly after repotting.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Cayenne Porterweed (Stachytarpheta cayennensis)
Where Cayenne Porterweed (Stachytarpheta cayennensis) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Lamiales |
| Family | Verbenaceae |
| Genus | Stachytarpheta |
| Species | Stachytarpheta cayennensis |
Similar in genus Stachytarpheta
Answers based on plant encyclopedia data
