Annual flower
Stock plant profile
Matthiola incana
An annual flower for full sun.
Last updated .
When to plant
When to plant Stock
Start seeds indoors
8 weeks before your last spring frost to 6 weeks before your last spring frost
Growing conditions
- Sun
- Full sun
- Lifecycle
- Annual
Common problems
Watch for these
Also watch for: heat stops bloom, white mold.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Matthiola incana (Stock, Brompton Stock, Gillyflower)
North Carolina Extension Gardener Plant Toolbox (NC State Extension). Supports indoor seed-starting timing (direct) and planting season (direct). Checked 2026-06-18.