September 2025 Delivery
Caesium Allium Bulbs
Deep blue flower heads that flower later in the allium season, a great addition to extend your flowering borders.
- Height (cm): 40cm
- Bulb Size (cm): 5/+cm
- Blooms: June/July
Planting Guide
| Species | Month | Depth | Spacing | Soil | Aspect |
|---|---|---|---|---|---|
| Allium | Sept-Nov | 3 x bulb height | 15-30cm | Well-drained |  |
| Anemone | Sept-Nov | 5cm | 5-10cm | Any |  |
| Bluebell | Aug-Dec | 5-10cm | 10cm | Moist |  |
| Camassia | Sept-Nov | 10cm | 15cm | Moist | |
| Chionodoxa | Sept-Nov | 5cm | 5cm | Well-drained | |
| Crocus | Sept-Nov | 5cm | 5cm | Well-drained | |
| Cyclamen | Aug-Oct | 5cm | 5cm | Well-drained | |
| Daffodil & Narcissi | Sept-Oct | 3 x bulb height | 10-20cm | Well-drained | |
| Erythronium | Sept-Nov | 10cm | 10cm | Moist | |
| Freesia | Aug-Oct | 5cm | 7cm | Well-drained | |
| Fritillary | Sept-Nov | 10-15cm | 20-25cm | Well-drained | |
| Hyacinth | Sept-Nov | 15cm | 10cm | Well-drained | |
| Ipheion | Sept-Nov | 5cm | 5cm | Well-drained | |
| Iris | Sept-Nov | 5cm | 5cm | Well-drained | |
| Muscari | Sept-Nov | 5cm | 5cm | Any | |
| Puschkinia | Sept-Nov | 5cm | 5cm | Well-drained | |
| Snowdrop | Sept-Dec | 10cm | 5cm | Moist | |
| Triteleia | Sept-Nov | 5cm | 5cm | Well-drained | |
| Tulip | Sept-Dec | 10-15cm | 10-15cm | Well-drained | |
| Wildflowers | Sept-Dec | 3 x bulb height | 10-15cm | Moist | |
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Full Sun
Partial Shade
Full Shade
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Boston Seeds is an independent seed merchant founded in 2002 by Andrew Wallis, after 25 years working for some of Europe’s leading seed houses. Find out more about Boston Seeds.
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