Larkspur
flower
⚠️ ALL PARTS TOXIC. Cool-season annual related to delphinium — similar spired look but much easier to grow. Direct sow only; needs cold to germinate. Self-seeds prolifically.
At a glance
- USDA Zones
- 3–9
- Sun
- Full sun (6+ hrs)
- Water
- Medium — water when top inch of soil is dry
- Soil
- Loam, sandy
- pH
- Neutral
- Spacing
- 6 in. between plants
- Per square foot
- 4 plants per square
- Days to maturity
- About 60 days
Planting & harvest windows
Northern Hemisphere timing. Adjust ±4–6 weeks based on your last/first frost dates.
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plant | ||||||||||||
| Harvest |
Plant Harvest
Good companions
Recommended varieties
- Giant Imperial Mixseed
Tall 4–5 ft spires in pastel pink, blue, purple, and white.
- Fancy Purpleseed
Deep rich purple blooms — dramatic in cottage gardens.
Add Larkspur to your raised bed — the planner handles spacing and companion warnings automatically.
Open the planner →