About
Allium cepa 'Mammoth Red' produces exceptionally large onions with a deep red skin and a robust, sweet taste. This variety is known for its impressive size and is suitable for exhibition. It has excellent storage capabilities.
About the genus
Allium consists of bulbous herbaceous perennials characterized by a pronounced onion or garlic aroma. They feature linear, strap-like, or cylindrical leaves that arise from the base. The flowers, which can be star-shaped or bell-shaped, are arranged in an umbel atop a stem that lacks leaves.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Clay, Loam, Sand, Chalk
- Soil pH
- Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H3
Plant details
- Plant type
- Herbs - Culinary, Bulbs
- Habit
- Clump forming
- Foliage
- Deciduous
- Height
- 0.1-0.5 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 1 year
- Fragrance
- Foliage, Fruit
Care notes
- Cultivation
- Grow in fertile, moisture retentive, but well-drained soil in full sun. Consider liming if the soil is acid, pH below 6.5. Yellowing and toppling of the foliage is a sign that the onions are reaching maturity. Lift and store in a cool dry place See How to grow: onions for further advice
- Pruning
- Not required
- Propagation
- Propagate by seed. See sowing vegetable seeds
- Pest resistance
- May be susceptible to onion fly, leek moth and narcissus eelworm
- Disease resistance
- May be susceptible to onion white rot, onion downy mildew, leek rust and onion neck rot. Bolting, producing flowers, may be a problem