You can plant your plugs and seedlings outside as soon as the risk of frost has passed – from April onwards. When planting outside, prepare your ground in advance, digging in plenty of organic compost in the weeks before and weeding thoroughly. Plant your seedlings between 6” (15cm) and 1ft (30cm) apart, depending on how big your plants are likely to grow, and protect them from slugs, snails and hungry thrushes. When moving plants outside, always harden off for a few days before you plant them into their final positions.