How to Grow Teasel
Dipsacus fullonum
Teasel is a striking biennial wildflower that forms a rosette of prickly leaves in its first year, then sends up tall architectural stems topped with egg-shaped purple flower heads in the second. Extremely easy to grow from seed sown direct in spring or autumn. Thrives in any reasonable soil in sun or partial shade. Leaves form cups at stem junctions that collect rainwater. Self-seeds prolifically — thin seedlings if needed. Leave seed heads standing through winter for goldfinches.
When to Start
Direct sow outdoors as soon as soil reaches 5°C — typically early to mid spring. Hardy enough to tolerate light frosts.
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Growth Stages
Approximate days from start
Care Essentials
- Teasel thrives without supplementary feeding in average garden soil. If growing on very poor soil, a single application of balanced fertiliser in spring of the flowering year is sufficient.
- Teasel is a low-maintenance biennial that self-seeds freely. Leave the spiky seed heads standing through winter — they are a magnet for goldfinches and provide strong architectural interest. Thin self-sown seedlings in spring to prevent overcrowding.
Growing Conditions
- Min. soil temperature
- 5°C+
- Direct sow
- —
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Spacing & Planting
| Plant spacing | 40 cm |
| Row spacing | 50 cm |
| Mature height | 175 cm |
| Mature spread | 40 cm |
Pests & Diseases
Pest Slugs
Identification: Irregular holes chewed in the leaves of first-year rosettes, often with slime trails visible in the morning.
- Apply a barrier of sharp grit or crushed eggshells around the rosette base.
- Use nematode slug control (Phasmarhabditis hermaphrodita) watered into damp soil in spring.
- Apply ferric phosphate pellets around affected rosettes.
Pest Aphids
Identification: Clusters of small green or black insects on flower stems and developing seed heads from June onwards.
- Spray with a strong jet of water to dislodge colonies.
- Encourage natural predators such as ladybirds and lacewings by growing companion flowers nearby.
- Spray with a pyrethrum-based insecticide if infestations are severe.
Pest Leaf-Mining Flies
Identification: Pale winding tunnels visible within the leaves of the rosette, caused by the larvae of small flies feeding inside the leaf tissue.
- Remove and destroy heavily mined leaves.
- Encourage parasitic wasps by planting small-flowered umbellifers nearby.
- No chemical treatment is generally warranted for cosmetic leaf mining on a wildflower.
Disease Powdery Mildew Erysiphe dipsaci
Symptoms: White powdery coating on leaves and stems, typically appearing in mid to late summer during dry spells.
Treatment: Improve air circulation by thinning overcrowded plants. Water at the base rather than overhead. Remove badly affected leaves.
Prevention: Avoid planting in dense, airless patches. Thin self-sown seedlings to 40 cm apart.
Disease Crown Rot Phytophthora spp.
Symptoms: The base of the rosette turns brown and mushy, causing the plant to collapse. Occurs in waterlogged conditions.
Treatment: Remove and destroy affected plants. Improve drainage before replanting.
Prevention: Grow teasel in free-draining soil. Avoid heavy clay or poorly drained sites.
Growing Conditions
| Min. soil temperature | 5°C |
| Base growth temperature | 5°C |
Frequently Asked Questions
- How far apart should I plant Teasel?
- Plant Teasel 40cm apart with 50cm between rows.
- Is Teasel frost hardy?
- Teasel is classified as Hardy.
