Sowing
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How to sow verveines (verbena and lemon verbena) Intro Verbena (Verbena spp.) and lemon verbena (Aloysia citrodora) can be raised from seed with good results if given warmth, light and well‑draining compost. Below are simple steps for successful sowing and early care. When to sow - Outdoor sowing (hardy verbenas such as V. bonariensis): sow outdoors in spring after last frost or autumn in milder areas. - Indoor sowing (most annual verbenas, lemon verbena): sow indoors 8–10 weeks before last expected frost for earlier flowering. Sowing mix and containers - Use a free‑draining seed compost or a 50:50 mix of multi‑purpose compost and horticultural grit or perlite. - Fill trays or small pots, firm lightly and water from base until compost is evenly moist. Sowing method - Surface‑sow seeds for most verbena species: press seeds lightly onto compost surface without covering, as many need light to germinate. - For larger seeds or varieties that require light cover, sprinkle a very thin layer (0.5–2 mm) of fine compost or vermiculite. - Label trays and keep cover (clear lid or polythene) to retain humidity until germination. Germination conditions - Temperature: maintain 18–22°C for reliable germination. Lemon verbena prefers warmer end of range. - Light: bright light is important; provide a sunny windowsill or growlight. - Time: germination usually occurs in 7–21 days depending on species and temperature. After germination - Remove cover once seedlings appear and provide good air circulation to avoid damping‑off. - Keep compost just moist, not waterlogged. - When seedlings have their first true leaves, prick out into individual pots using fresh compost and handle by leaves, not stems. Hardening off and planting out - Harden off gradually over 7–10 days before planting outside. - Plant out after risk of frost has passed for tender varieties. Space plants according to variety (30–45 cm typical for many garden verbena). Care tips - Position in full sun for best flowering; ensure soil is well drained. - Feed monthly with a balanced liquid fertiliser while plants are establishing and during the flowering period. - Deadhead spent flowers to encourage continuous bloom for annual verbenas; cut back leggy growth to promote bushiness. Propagation alternative - Many verbenas root readily from softwood cuttings taken in late spring or early summer — a useful alternative to sowing for true‑to‑type plants. Problems to watch for - Damping‑off: avoid over‑watering and overcrowding seedlings. - Powdery mildew: improve air circulation and avoid overly humid conditions. - Pests: aphids and whitefly can occur; monitor and treat early. Varieties and uses - Verbena bonariensis: tall, airy, excellent for mixed borders and wildlife. - Bedding verbenas (e.g. V. x hybrida): compact, profuse flowering for containers and beds. - Lemon verbena (Aloysia citrodora): aromatic leaves for culinary and tea use; usually tender and best grown in pots in cooler climates. Quick checklist - Use free‑draining compost, keep seeds surface‑sown where light is needed, maintain 18–22°C, water moderately, prick out when true leaves appear, harden off before planting out. If you want, tell me which verveine you mean (garden verbena or lemon verbena) and I can provide a tailored sowing calendar for UK/Irish climates.
by Gwenaëlle
13 April 2026 4 min.
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