Ornamental allium are just a small part of a large genus of over 400 species of mostly onion scented herbs that includes the common onion, leek, garlic, chive and shallot. This makes gardeners wonder if they should include them in their ornamental gardening plans since it conjures up images of supermarket produce. Allium blooms create high drama and interest in the garden and range in color from white, yellow, pink to purple, few to a great many, always in a ball shape of loose or tight, sparse or dense flower clusters. The leaves of only a few smell like onions - normally only when bruised. With over 300 species to choose from, the allium group is a popular choice for the spring garden.
About this Variety
Allium Firmament is considered one of the favorite allium varieties due to its flower heads. Blooms consist of dark silvery purple baseball-sized spheres.
- Large, silvery-purple flower heads
- Naturalizes easily in the garden
- Deer and rodent resistant
- Beneficial to pollinators; Attracts butterflies
- Drought tolerant & easy to grow
Late Spring to Early Summer
Grows 24-36" tall
Plant 8" apart, 6-8" deep
Grow as Perennial in zones 5-8. Grow as Annual elsewhere.
Plant in the fall, before the first frost hardens the soil. Dig a hole to the required depth. Place bulb in hole, pointed side up. Cover with soil and water thoroughly. Mulch in extreme climates. For container planting, bury the bulb three times as deep as the bulb is wide. In zones 6 and below, you will need to protect your bulb containers. Place them near the foundation of the house or other structure. In zones 3-5, place the container in an unheated garage or shed. After blooming, leave the bulbs in place so plants can clump or reseed. Divide only when containers or planting spaces become too crowded. Propagate in the fall by division after they have been chilled for four weeks in a moist medium.
Allium does not like 'wet feet'. Be sure to plant in a sunny location where the soil drains well. The bulbs will rot in wet areas. Dig, divide and replant bulbs after a few years of decreasing flower production.