Ornamental Allium plant profile
Allium spp.
A perennial ornamental for full sun.
Last updated .
When to plant
When to plant Ornamental Allium
Ornamental allium grown from bulbs is fall-planted (Iowa State: around October) before the ground freezes, for late-spring to early-summer flowers. Container-grown plants can go in during spring or early fall.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Ornamental Allium in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Planting depth
- 3 in
- Lifecycle
- Perennial
Common problems
Watch for these
Also watch for: bulb rot, aggressive reseeding.
Next steps
Continue with Ornamental Allium
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- All About Ornamental Onions
Iowa State University Extension and Outreach. Supports general reference. Checked 2026-06-13.