How to Grow Yellow Rattle
Rhinanthus minor
Hardy Cool Season Single Harvest
Yellow rattle is the keystone plant for creating wildflower meadows. This semi-parasitic annual weakens grass by tapping into its roots, opening space for wildflowers to establish. Sow fresh seed in autumn on scarified soil — it needs winter cold to germinate. Once established, it self-seeds freely each year, progressively reducing grass dominance. Cut the meadow in late summer after seeds have dropped and rattled dry in their pods.
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
Sow seeds
Day 0 Germination
~21 days Flowering
~150 days Fruiting
~195 days Seed to harvest ~195 days
Approximate days from start
Care Essentials
- No feeding required. Yellow rattle is semi-parasitic on grass roots and obtains nutrients from host plants.
- Semi-parasitic annual essential for establishing wildflower meadows. Weakens vigorous grasses, allowing wildflowers to compete. Sow fresh seed in autumn directly onto scarified soil among existing grass.
Growing Conditions
- Min. soil temperature
- 5°C+
Don't know your frost date? Find it here
- Direct sow
- —
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Spacing & Planting
| Plant spacing | 15 cm |
| Row spacing | 20 cm |
| Sow depth | 0 cm |
| Mature height | 50 cm |
| Mature spread | 15 cm |
Growing Conditions
| Min. soil temperature | 5°C |
| Base growth temperature | 3°C |
Frequently Asked Questions
- How far apart should I plant Yellow Rattle?
- Plant Yellow Rattle 15cm apart with 20cm between rows.
- Is Yellow Rattle frost hardy?
- Yellow Rattle is classified as Hardy.
