Sow on a windowsill in a propagator or in a greenhouse three seeds per 15cm pot 13mm deep in good quality finely sieved moist compost at 18 to 20 degree Celsius Germination 5 20 days Grow on in a warm frost free place Acclimatize the plants to outside conditions before planting out against a sunny fence Alternatively sow the seed thinly direct into finely raked moist warm weed free soil where the plants are to flower in may