If you sowed wallflowers from seed in June they should be ready to plant out into their final growing positions. They need plenty of space to grow into strong, bushy plants. (If you didn’t sow them, it’s a good time to look for young plants at the garden centre.) How do you do it? Dig a hole slightly bigger than their existing container, place some well-rotted compost in the base, carefully ease them out of their pot and pop them in the ground. Backfill with soil, firm in around the stem and water well. If planting in groups, space about 25cm (10in) apart. Do the same with biennial sweet Williams, sweet rocket and forget-me-nots.