I have two garden planters measuring 1 metre by 50 cm. I’d like to get them planted up with flowers that will add colour from spring through to autumn if possible. I have bought some dwarf daffodil bulbs for spring but I have no idea what to put in for Summer colour. I have orange Lilly bulbs which are gorgeous when they flower but I’m lucky if the flowers last a week. Can anyone suggest bulbs, perennials or self seeding plants that will give me bursts of colour throughout summer and come back each year with minimal fuss?