
Allium 'Cowanii' (neapolitanum)
A vision of pure, bridal white, this allium brings delicate elegance and a fresh sparkle to the late spring garden. Often known as the Naples Garlic, 'Cowanii' is a select, more robust form that produces loose, airy umbels of pristine white, star-shaped flowers. Each floret features a subtle green eye, adding to its charm. Unlike the dense globes of other alliums, these blooms create a light, see-through effect, perfect for illuminating shady corners or weaving through bolder colours in a border. They are fantastic cut flowers, prized by florists for their long vase life and graceful appearance in bouquets. Plant them in generous sweeps to create a cloud of white that brightens the landscape and bridges the gap between spring bulbs and summer perennials.
Botanical name | Allium neapolitanum 'Cowanii' |
Flower colour | Pure white |
Bulb size | 5/+ cm |
Established height | 30-40 cm |
Established spread | 5-10 cm |
Plant spacing | 150-200 bulbs per m² |
Leaf colour | Green |
Habit | Upright |
Life cycle | Perennial |
Hardiness | Hardy |
Years to establish | 1st year |
Sunlight | Full sun or partial shade |
Position | Sheltered |
Suitable for | Borders, Naturalizing |
Soil acidity | Any |
Soil moisture | Moist but well-drained |
Soil type | Loam, Sandy, Chalky |
RHS Award (AGM) | Yes |
Growing skill | Easy to grow |
Pollinator-friendly | Yes |
Deer resistant | Yes |
Planting and Flowering Calendar
Key Features
Packed in paper
Packed peat-free
Great for Shade
Attracts wildlife
Fragrant
RHS Award (AGM)
Perfect for pots
Good for cutting
Naturalising