How to grow Zinnia in the UK
Zinnia elegans
Zinnia (Zinnia elegans) is a flower that grows well in UK gardens. Hot-summer flower — plant in the sunniest spot. Direct sowing rarely works in UK. This guide covers when and how to sow Zinnia, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Zinnia
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr Sow | May | Jun Plant | 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 Zinnia
No specific companion notes for this plant.
Add Zinnia to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Zinnia FAQs
When should I sow Zinnia in the UK?
In the UK, sow Zinnia in April. Sowing across these months gives the plant the right soil temperature and day length to establish well.
How much sun does Zinnia need?
Zinnia prefers full sun (6+ hrs direct).
Is Zinnia easy to grow?
Easy — good for beginners. Hot-summer flower — plant in the sunniest spot. Direct sowing rarely works in UK.