How to grow Diascia in the UK
Diascia
Diascia (Diascia) is a flower that grows well in UK gardens. Loves containers. Drought-tolerant once established. Cut back hard if it gets leggy. This guide covers when and how to sow Diascia, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Diascia
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr | May Plant | 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 Diascia
No specific companion notes for this plant.
Add Diascia to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Diascia FAQs
How much sun does Diascia need?
Diascia prefers full sun (6+ hrs direct).
When should I plant Diascia in the UK?
In the UK, plant Diascia in May, June. Planting in this window gives the roots time to establish before the plant is asked to grow away.
Is Diascia easy to grow?
Easy — good for beginners. Loves containers. Drought-tolerant once established. Cut back hard if it gets leggy.