Light-blue snakeweed
Stachytarpheta jamaicensis · Verbenaceae
📷 Vengolis · CC BY-SA 4.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around light-blue snakeweed and prepare for winter.
ID card
- Common name
- Blue vervain
- Family
- Verbenaceae
- Form
- Herbaceous
- Flowering
- June to November
- Adult size
- 24 to 35 inches tall
- Foliage
- Evergreen to semi-evergreen
- Hardiness
- Frost-sensitive
- Origin
- Jamaica and the Caribbean
Care
Light exposure
Place your blue vervain in full sun for at least 6 hours daily to enjoy generous, vibrant blooms. If you're growing it in a hot region, a bit of afternoon shade can help it through heat waves. Indoors, position it as close as possible to your brightest window.
Regular watering
Water generously during active growth (spring-summer), keeping the soil slightly moist without waterlogging it. Reduce watering in winter or during dormancy. Let the soil dry slightly between waterings in the cold season.
Soil type
Prepare a light, well-draining mix: horticultural soil mixed with sand or perlite works perfectly. Ensure good drainage as this plant dislikes standing water. Soil rich in organic matter promotes growth, but don't overdo it.
Balanced feeding
Nourish it every 15 days with balanced liquid fertilizer or one rich in potassium during flowering (April to October). Stop fertilizing in winter. Moderate feeding is enough; avoid excess that would favor foliage over flowers.
Pruning and cleanup
Pinch young stems regularly to encourage branching and a more compact shape. Remove spent flowers as they fade to promote continuous blooming. In late winter or early spring, cut it back lightly to invigorate new growth.
Health watch
Watch for whiteflies, especially indoors. Good air circulation and controlled humidity reduce risk. If infestation occurs, treat with mild insecticidal soap following recommended intervals.
Did you know?
Blue vervain gets its name from its stunning blue-violet flower spikes that form elongated, elegant racemes—very distinctive. Native to the Caribbean, it has conquered tropical and subtropical gardens worldwide thanks to its spectacular blooms and ability to flower almost year-round. In Africa, certain Stachytarpheta species are traditionally used in herbal medicine, testament to the botanical prestige of this plant family.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- VervainVerbena officinalis
- Verveine NodiflorePhyla nodiflora
- Purple verbenaVerbena bonariensis
- Lemon verbenaAloysia citrodora
- Aztec sweet herbLippia dulcis
- Aloysia polystachyaAloysia polystachya
Tips generated and checked by Viridia — adapt them to your local climate.