Runner Bean - Armstrong This is the product of over eight years development. This stringless 'Enorma' type yields heavy crops of long, fine pods of exceptional quality and outstanding flavour. Sow indoors for surest results from April to May, 2.5cm deep into individual pots of compost. Water well and place in a warm position. A temperature of 15-20°C is ideal. Keep moist. Seedlings usually appear in 7-14 days. Gradually accustom plants to outside conditions, before planting out 25cm apart, during May/June when frosts are over. Allow 45cm between rows. Or sow outdoors May/July for ease, where they are to crop, 5cm deep, directly into finely-prepared, well-cultivated, fertile soil, which has already been watered. Delay sowing if soil is cold or waterlogged. Sow two seeds together, 30cm between each position. Allow 45cm between rows. Thin to leave stronger plant. Water well until plants are established. Harvest from July to October.