How to Grow Gentian
Gentiana acaulis
Gentiana acaulis is an iconic alpine with intense deep blue trumpet flowers in spring. Plant in a rock garden or trough in gritty, moist, acidic soil in full sun. It dislikes dry or alkaline conditions and resents being moved once settled. Top-dress with grit in autumn to keep the collar dry and prevent rot. Divide established clumps in early spring if they become congested.
Yearly Lifecycle
Care Essentials
Apply a dilute ericaceous liquid feed in spring as growth begins. Avoid high-nitrogen feeds.
Watch For
- Crown rot in poorly drained soil
- Vine weevil grubs at roots
- Slug damage to new growth
Companions
Saxifraga, Sempervivum, Primula, Thyme
Care Requirements
Light
Full sun
Needs full sun for best flowering. In very hot regions a little afternoon shade is tolerable, but too much shade results in poor blooms and leggy growth.
Watering
Consistent moisture, never dry out
Although alpine, this gentian needs constant moisture at the roots. Water during dry spells and mulch with fine grit to retain moisture without causing crown rot.
Fertilizing
Dilute ericaceous feed in spring
Apply a dilute ericaceous liquid feed once in spring as growth begins. Avoid high-nitrogen feeds which promote leaf at the expense of flowers.
Growing Tips
Acidic, gritty soil is essential
Gentians must have moist, acidic, gritty soil. Add ericaceous compost when planting and avoid any lime or alkaline material near the roots.
Do not let it dry out
Although alpine, this gentian needs consistent moisture at the roots. Water during dry spells and mulch with fine grit to retain moisture without causing rot.
Leave undisturbed
Established plants resent root disturbance. Only divide when clumps become very congested and flowering declines.
Spacing & Planting
| Plant spacing | 20 cm |
| Row spacing | 25 cm |
| Mature height | 10 cm |
| Mature spread | 20 cm |
Low mat-forming alpine. Space in rock garden pockets or between stones. Resents disturbance once established.
