1/8" — needs darkness to germinate.
Recommended. Direct sow in early spring 3-4 weeks before last frost, or early autumn in zones 7-10.
PLACEMENT & CULTIVATION
Larkspurs are favorite cut flowers–both fresh and dried–prized for their varied hues from jewel tones to misty pastels, tall upright growth, and graceful foliage. They add a welcome vertical element to early summer gardens. Allow enough space around plants for good air circulation and mulch, keeping away from stems, to help keep the soil cool, for they perform best where summer nights cool down.
Do not allow soil to dry out; water regularly, particularly during dry periods, but avoid saturated soils.
Slightly acidic to slightly alkaline; if soil is very acidic, add lime before planting.
Mix in 2-4" of compost prior to planting.
Diseases & Pests:
Susceptible to fungal problems in poorly drained locations, or where foliage stays wet. Space to allow for good air circulation and use organic fungicides if needed.
When to Cut for Bouquets:
2-5 florets open