How to grow Larkspur in the UK
Consolida ajacis
Larkspur (Consolida ajacis) is a flower that grows well in UK gardens. Annual delphinium effectively. Sow direct — it hates transplanting. All parts toxic. This guide covers when and how to sow Larkspur, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Larkspur
Sowing and harvest window through the year (UK):
Jan | Feb | Mar Sow | Apr Sow | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
Soil, position & care
- Soil
- Any reasonable, moisture-retentive but free-draining soil
- Soil pH
- 6.0–7.5
- Position
- Full sun for most; some tolerate light shade
- Sowing depth
- Surface to 1 cm (check light requirement)
- Spacing
- 15–30 cm apart
- Sowing
- Sow under cover late winter–spring, or direct after the last frost
- Growing
- Water regularly; pinch tips for bushier plants
- Harvest & upkeep
- Deadhead often to prolong flowering
- Watch for
- Slugs and snails on seedlings; aphids on soft growth
Companion planting for Larkspur
No specific companion notes for this plant.
Add Larkspur to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Larkspur FAQs
When should I sow Larkspur in the UK?
In the UK, sow Larkspur in March, April. Sowing across these months gives the plant the right soil temperature and day length to establish well.
How much sun does Larkspur need?
Larkspur prefers full sun (6+ hrs direct).
Is Larkspur easy to grow?
Easy — good for beginners. Annual delphinium effectively. Sow direct — it hates transplanting. All parts toxic.