Now is a good time to plant out gladioli. These plants can be grown in several ways: in groups in the border, in patio containers, or in rows for cut flowers. For the best effect in a garden opt for the former. Plant the corms in groups of five or more. They should be set 4-6in (10-15cm) apart, and 3-4in (7.3-10cm) deep. The deeper planting means that plants may not need staking.