When’s The Best Time To Plant Bulbs & Corms? Each Bulb & Corm Has Month When Planting Is Best. Outside Of These Months Flowering Maybe Delayed Or Fail.
The table below shows the best time of year to plante the depth of planting and how far apart the bulbs or corns should be.
We are dealing with nature so some variation is possible and will depend on your location, soil type, weather and microclimate. For cut flowers some spacings may need amending.
| Bulb/corm | Best month for planting | Depth of top of bulb below surface (inches) | Distance apart (inches) |
| Montbretia | March | 3 | 6 |
| Tritonia | March | 4 | 4 |
| Anemone (St Brigid) | March or Oct | 2 | 5 |
| Gladiolus | April | 4 | 9 |
| Gladiolus nanus | April | 2 | 3-4 |
| Tigridia | April | 4 | 4 |
| Crocus (autumn) | July | 2 to 3 | 5 |
| Fritillaria | July/August | 4 | 6 to 9 |
| Stembergia | July | 3 | 4 |
| Belladonna Lily | Aug | 6 | 6 |
| Bluebells | Aug | 6 | 3 to 4 |
| Bulbocodium | Aug | 4 | 4 |
| Erythronium | Aug | 4 | 3 |
| Chionodoxa | Aug | 3 | 3 |
| Colchicum | Aug | 4 | 3 to 6 |
| Leucojum | Aug | 3 | 4 |
| L candidum | Aug | 2 | 12 |
| Scilla sibirice | Aug | 3 | 3 |
| Snowdrops | Aug | 3 to 4 | 3 |
| Winter Aconite | Aug | 2 to 3 | 3 to |
| Daffodils | Sept/Oct | 4 to 6 | 6 |
| Iris (English) | Sept | 5 | 3 to 6 |
| Iris (Spanish) | Sept | 4 | 4 |
| Iris (reticulata) | Sept | 4 | 3 |
| Ixia | Sept | 3 | 4 |
| Allium | Oct | 4 | 4 |
| Anemone fulgens | Oct | 2 | 5 |
| Anemone (St Brigid) | Oct or early spring | 2 | 5 |
| Anthericum | Oct | 4 | 6 |
| Camassia | Oct | 4 | 4 |
| Crinum | Oct | 6 | 18 |
| Crocus (spring) | Oct | 2 to 3 | 3 |
| Hyacinths | Oct | 4 | 7 |
| Lilium auratum | Oct | 4 to 6 | 12 |
| L bulbiferum | Oct | 4 to 6 | 12 |
| L henryi | Oct | 4 to 6 | 12 |
| L pardalinum | Oct | 4 | 12 |
| L speciosum | Oct | 4 to 6 | 12 |
| L tigrinum | Oct | 4 to 6 | 12 |
| Muscari | Oct | 3 | 3 |
| Ornithogalum | Oct | 4 | 4 |
| Trillium | Oct | 3 | 4 |
| Galtonia | Nov | 6 | 9 |
| Gladiolus (colvillei type) | Nov | 4 | 9 |
| Lily of the Valley | Nov | 2 | 4 |
| Tulips (long stem) | Nov | 5 | 9 |
| Tulips (short stem) | Nov | 4 | 6 |
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