The dahlia has made a comeback lately, going from pariah to must have, so you can plant it out without fear of neighbourly obloquy. Now that fear of frost is past, the young plants should be set out at their final stations. It’s a good idea to provide a stake behind each plant, as the dahlia is a great brute with a lot of foliage. Dig a suitable hole, get the level right by laying a cane across and lining the compost surface up with it, backfill and firm. Lash the plant securely to the stake with twine in a figure of eight.