onion 'Mammoth Red'

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

Not required

Propagate by seed sown under cover with heat in mid- to late winter, harden off before planting out. Sow outdoors from late winter until mi-spring. If growing from sets, plant outdoors from mi-March to mid-April

May be susceptible to onion fly, leek moth and narcissus eelworm

May be susceptible to onion white rot, onion downy mildew, leek rust and onion neck rot. Bolting, producing flowers, may be a problem