Ornamental onion: when to sow, plant and see it flower
Sowing, planting and flowering dates for your climate, with growing advice.
Photo: Johnny_Harvester, Pixabay Content License · image resized
When to sow and plant in your region
Average dates, computed from the frost dates of each climate. For your exact dates, choose your town.
| Climate | Plant out | Flowering |
|---|---|---|
| South and east of England | 4 September – 3 December | 22 April – 22 July |
| South-west England and Wales | 20 September – 19 December | 11 April – 11 July |
| Midlands, northern England and Northern Ireland | 1 September – 27 November | 3 May – 2 August |
| Scotland | 1 September – 18 November | 13 May – 12 August |
| Ireland | 11 September – 10 December | 19 April – 19 July |
Growing
- Life cycle
- Bulb (planted, not sown)
- Family
- Amaryllidaceae
- Latin name
- Allium hollandicum
- Cold tolerance
- Hardy (withstands frost)
- Spacing
- 10–20 cm
Sources
- Jardiner Malin — flower and bulb fiches (same species; the lin, bleuet and lavatère pages are seed product pages, and lin is red flax)
- Gerbeaud — flower and bulb fiches (cosmos, souci, capucine, tournesol, alysse, zinnia, nigelle de Damas, coquelicot, pavot de Californie, pois de senteur, muflier, reine-marguerite, ipomée, mauve annuelle, annuelles rustiques, giroflée ravenelle, digitale, myosotis, pensée, rose trémière, pâquerette, lupin, ancolie, delphinium, échinacée, rudbeckia, gaillarde, achillée, tulipe, crocus, jacinthe, perce-neige, muscari, ail d'ornement, dahlia, glaïeul, lis, bulbes d'automne, profondeur de plantation)
- Royal Horticultural Society — growing guides (annuals and biennials: sowing in spring, sowing in autumn; sunflower, sweet pea, zinnia, lavatera, foxglove, lupin, hollyhock, delphinium, aquilegia, rudbeckia, achillea, tulip, daffodil, crocus, hyacinth, snowdrop, allium, dahlia, gladioli, lily, bulbs)
- RHS — Plant pages (hardiness ratings H1-H7)
- Plantura — flower portraits and planting guides (Cosmea, Kornblume, Jungfer im Grünen, Mohnblume, Flachs, Goldlack, Vergissmeinnicht, Stockrose, Silberblatt, Bartnelke, Kokardenblume, Rittersporn, Akelei, Sonnenhut, Blumenzwiebeln, Tulpen, Gladiolen)