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Allium Ostara

Allium Ostara
Ornamental Onion, Flowering Garlic

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Thank you to the individuals (for order preparation and shipping service), the bulbs received are healthy. Planted near yellow or orange roses, I am now patiently awaiting the flowering...

Thierry, 27/05/2023

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This plant carries a 12 months recovery warranty

More information

Value-for-money
A medium-height variety of ornamental garlic whose flowers are gathered in a perfect dense purple ball. Its compound foliage, made of broad leaves, remains decorative before, during, and after flowering, which takes place from late May to early July. It can be planted in sunny borders. It is suitable for pot cultivation, adding a beautiful touch to a patio or balcony. Its flowers are perfect in fresh or dried bouquets. Plant it in the sun, in ordinary, well-drained soil that is dry in summer.
Flower size
9 cm
Height at maturity
45 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -20°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time May to July
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Description

Allium 'Ostara' is a hybrid ornamental garlic of medium stature, with perfectly round flowers of intense purple-pink, which faithfully blooms every year in late spring or early summer. Unlike many others, this variety keeps its beautiful foliage before, during, and after flowering. It boasts a colourful flowering, animated by a constant flight of pollinating insects. Reliable and easy to grow, it thrives in the sun, in ordinary but well-drained soil. Perfect for bordering an alley or a bed. It also works well in a rock garden or a planter on a patio. Its flowers are very long-lasting in bouquets, fresh or dried.

 

Allium 'Ostara' is a variety of hybrid ornamental garlic resulting from the cross-breeding of two botanical species: A. karataviense and A. atropurpureum. All these plants belong to the Amaryllidaceae family. They are cousins of garlic and leeks, with which they share a characteristic odour in their foliage, perceptible when crushed.

The 'Ostara' cultivar develops in spring from a slightly flattened bulb covered with a whitish epidermis. It forms a clump of wide, decorative, blue-green leaves. It reaches about 30cm (12in) in height and 30 to 40cm (12 to 16in) in width. Flowering takes place from May-June to July, earlier or later depending on the climate. Flowering stems measuring 40 to 50cm (16 to 20in) in height emerge from the centre of the clumps. Each stem carries a solitary inflorescence in the shape of a perfect sphere measuring 7 to 10cm (3 to 4in) in diameter. The compact inflorescence is composed of a multitude of tiny star-shaped flowers in intense pink-purple. They are nectar-rich and honey-producing. The deciduous foliage dries up a few weeks after flowering. The plant then survives the winter in the form of bulbs. This variety easily naturalises by producing bulb offsets.

Planted en masse along an alley, in small groups in a rock garden, as a border for a bed, or even combined with flowers in shades of purple, pink, and blue, this 'Ostara' ornamental garlic proves to be a gem for romantic flower beds. It goes perfectly with catmints, bellflowers, and agastaches. Also consider pairing it with lavenders and small-sized grasses such as Stipa tenuifolia or Pennisetum advena 'Rubrum', and many more. Its flowers can also structure a contemporary garden where various geometric shapes oppose each other. Furthermore, it can be planted with landscape roses and boxwoods trimmed into cones.

In short, the possibilities are endless! There is a corner in your garden, as well as on your balcony, where this garlic will work wonders.

Allium Ostara in pictures

Allium Ostara (Flowering) Flowering
Allium Ostara (Plant habit) Plant habit

Flowering

Flower colour purple
Flowering time May to July
Inflorescence Umbel
Flower size 9 cm
Fragrance slightly scented
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 45 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Allium

Cultivar

Ostara

Family

Alliaceae - Liliaceae

Other common names

Ornamental Onion, Flowering Garlic

Origin

Cultivar or hybrid

Planting and care

Alliums are easy to grow in sunny and well-drained soil that does not retain too much moisture. Plant the bulbs preferably before the end of October so that they have time to establish. They are sensitive to excess winter moisture. 'Ostara' enjoys the sun and thrives in any good, well-loosened, and drained garden soil. Once the foliage has dried, dry soil is perfectly tolerated by the resting bulb. In clay soil, incorporate a bit of gravel or coarse sand. It is hardy and not demanding in terms of water, but appreciates the soil remaining slightly moist during flowering. Unlike tulip bulbs, ornamental garlic bulbs repel rodents. These plants have few enemies in our gardens.

Planting period

Best planting time March, October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Edge of border, Container, Slope
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 9 per m2
Exposure Sun
Soil pH Neutral, Any
Soil type Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil, well-drained garden soil.

Care

Pruning No pruning necessary
Disease resistance Good
Overwinter Can be left in the ground
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