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.
In your Leaftide garden 
- Hardiness
- Hardy
- Season
- Cool Season
- Harvest
- Single Harvest
- Spacing
- 15 cm
- Height
- 50 cm
- Min. soil temperature
- 5°C+
- Start from
- Seed
- Light
- Full sun to part shade
- Water
- Low
When to Start
Direct sow outdoors as soon as soil reaches 5°C — typically early to mid spring. Hardy enough to tolerate light frosts.
Don't know your frost date? Find it here →
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
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.