Dahlia: when to sow, plant and see it flower
Sowing, planting and flowering dates for your climate, with growing advice.
Photo: Nennieinszweidrei, 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 | 20 May – 17 June | 23 May – 3 November |
| South-west England and Wales | 22 May – 19 June | 12 May – 19 November |
| Midlands, northern England and Northern Ireland | 1 June – 29 June | 3 June – 28 October |
| Scotland | 13 June – 11 July | 13 June – 19 October |
| Ireland | 1 June – 29 June | 20 May – 10 November |
Growing
- Life cycle
- Bulb (planted, not sown)
- Family
- Asteraceae
- Latin name
- Dahlia
- Cold tolerance
- Tender (killed by frost)
- Spacing
- 40–100 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)
- 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)
- The Old Farmer's Almanac — flower growing guides (cosmos, calendula, marigolds, nasturtiums, sunflowers, sweet alyssum, zinnias, sweet peas, snapdragons, morning glories, poppies, bachelor's buttons, foxglove, pansies, hollyhocks, lupines, columbine, delphiniums, coneflowers, black-eyed Susans, yarrow, dianthus, tulips, daffodils, crocuses, hyacinths, snowdrops, dahlias, gladiolus, lilies)
- Longfield Gardens (US bulb supplier) — gladiolus and dahlia guides