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Allium triquetrum
Three-cornered garlic
Allium triquetrum
Allium triquetrum, commonly known as three-cornered leek or angled onion, is a bulbous perennial flowering plant in the amaryllis family, Amaryllidaceae. It is native to the Mediterranean region and has naturalized in other parts of the world, including Britain, Ireland, Australia, New Zealand, and the Pacific Coast of North America. It is recognizable by its three-cornered stems, white bell-shaped flowers with a green stripe, and a distinct oniony or garlicky smell. While considered edible, it can be invasive in some areas.
CategoryDetails
Invasive StatusInvasive Status
Plant TypePerennial plant
Culinary UsageEdible plant
Duration to maturity6 months to harvest
Estimated Plant Lifespan2 years lifespan
Sun Requirements2-4 hours direct sunlight (Partial Shade)
Pollination

Method: animal

Notes: Primarily pollinated by bees and other insects.

Watering Requirements

Method: Top watering

Frequency: Water regularly during the growing season, keeping the soil moist but not waterlogged. Reduce watering during dormancy.

Humidity Requirements

Level: moderate

Cleaning RequirementsRemove flower heads after blooming to prevent self-seeding and to encourage bulb growth. Can tolerate some neglect but thrives in moist, well-draining soil.
Temperature Range

Min: -5°C

Max: 30°C

Daucus carota
wild carrot
Daucus carota
Carrots and alliums are good companion plants. The carrot attracts beneficial insects like ladybugs and lacewings that prey on pests. It also helps to loosen the soil.
Lactuca sativa
lettuce
Lactuca sativa
Alliums like three-cornered leek can help to deter pests that might attack lettuce.
Phaseolus vulgaris
Common Bean
Phaseolus vulgaris

Beans are sensitive to the sulfur compounds released by alliums, and their growth can be inhibited if planted too close.

Onion fly

The larvae of the onion fly burrow into the bulbs, causing them to rot and the leaves to yellow and wilt.

Leek moth

Leek moth larvae mine the leaves, creating translucent patches and affecting the plant's vigor.

Steps:

    • Divide the bulbs in late summer or early fall after flowering.
    • Replant the bulbs in a new location, ensuring they are spaced appropriately.
    • Collect seeds after the flowers have faded.
    • Sow seeds in spring or fall in well-draining soil.

Neem oil

Effective against pests like onion flies and leek moths.

Seaweed extract

Provides essential nutrients and promotes healthy growth.