Plant in spring for summer flowering. From Gladioli to Dahlias, from Begonias to Calla Lilies. Planting summer bulbs in Spring means enjoying colour all summer long. Summer bulbs are the perfect way to add bright notes of summer colour to the border. An existing planting can always use some added sparkle. After all, a riot of colour is what summer is all about! Summer bulbs, - corms and - tubers can be planted from mid-March to mid-June, as long as the danger of frost has passed. They will then produce flowers in abundance that very summer. Some summer bulbs, like Dahlias, Crocosmias and Begonias, can even keep on flowering into the autumn. We ship our spring planting bulbs in spring, from late Feb through May, until stock runs out. It's the perfect planting time!