Set plants outside when it is reliably warm in June. Basil needs real warmth and regular fertilization. Space them 30cm (12") apart in rich soil and in full-sun. If this is not possible in the garden, grow these plants in containers in full-sun. Gather fresh leaves before the flowers appear by cutting the growing tip and the 2 pairs of leaves below it for the kitchen. Keep flowers picked to encourage new leaf growth. Once plants are established, pinch out the top to encourage a bushier plant.