Prepare the area by digging in plenty of organic matter, ideally in fall. Buy plug plants or, where there is space under cover, sow tomato, runner bean, red cabbage, and sweet corn seeds in pots, harden them off, and plant out after the risk of frost has passed. Plant tomatoes in a growing bag because they thrive on the rich soil, adding canes for support and pinching out sideshoots as they grow. Give the runner beans wires to climb up. Plant sweet corn in a block to aid pollination, and direct-sow a few lettuce seeds regularly to ensure a continuous crop. Water young plants in, and continue watering and fertilizing regularly those in growing bags.