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Allium triquetrum

Allium triquetrum
Three-cornered leek, Three-cornered garlic, Ornamental Onion

3,6/5
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4 reviews

Fast shipping but upon planting, one of the bulbs is completely rotten, so it's beyond saving, what a shame.

nad, 31/10/2024

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More information

A coastal bulbous plant with rapid growth. It flowers in umbels of white bells on a triangular stem measuring 20 to 50cm (8 to 20in).
Flower size
3 cm
Height at maturity
35 cm
Spread at maturity
20 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°C
Soil moisture
Moist soil
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Recommended planting time September to November
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Flowering time March to May
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Description

Allium triquetrum is a small ornamental garlic, which bears white bell-shaped flowers with green veins. Its stem has the characteristic of being triangular, hence its name of three-cornered garlic or three-cornered stem garlic.

It is a creeping bulbous plant, 20 to 50cm (8 to 20in) tall, with a glabrous, triangular, thick stem. It has deciduous, linear, medium green, flat leaves, 5 to 10mm wide. From March to May, inflorescences grow at the ends of the stems in loose umbels, with 3 to 5 white bell-shaped flowers with green hearts and central veins on the petals. When cut, it gives off a strong garlic smell.

Native to Mediterranean regions, Allium triquetrum tolerates all rich, moist but well-drained soils in warm situations. Mulch in winter to protect it from the cold. Be aware that it quickly becomes invasive when it is happy. Cultivation in pots is possible in regions with severe cold.

Allium triquetrum is used to dress banks or border pathways.

Attention: this species can become invasive in mild and oceanic climates, causing significant ecological disorders. It can be replaced by many other varieties of ornamental garlic.

Plant habit

Height at maturity 35 cm
Spread at maturity 20 cm
Growth rate normal

Flowering

Flower colour white
Flowering time March to May
Flower size 3 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Allium

Species

triquetrum

Family

Alliaceae - Liliaceae

Other common names

Three-cornered leek, Three-cornered garlic, Ornamental Onion

Origin

Cultivar or hybrid

Product reference966111

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Planting and care

Plant Allium triquetrum in autumn in rich, moist but well-drained soil in a warm location, spaced 15cm (6in) apart. Add sand to the planting hole to improve drainage and avoid overly acidic soils. It can withstand harsh winters if water is not allowed to stagnate and by protecting it with a good mulch. Alternatively, you can grow it in a pot in good, loose and well-drained compost.

Planting period

Recommended planting time September to November
Planting depth 10 cm

Intended location

Type of use Edge of border, Slope
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Beginner
Planting density 10 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Calcareous
Soil moisture Moist soil, very well-draining

Care

Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
3,6/5
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