Allotments are recreational areas, so plant flowers as well as vegetables and make a space for the family to enjoy as well. You can sow cosmos seeds in March or April in plug trays.
Sow two seeds per plug and prick out one if both germinate. Then plant in the garden about a foot apart. Cosmos provide a large amount of cut flowers over the season and are great for the bees. You’ll probably need to stake the plants once they grow as they do have a tendency to fall over especially in windy areas. Cosmos need to be picked or deadheaded regularly to ensure flowering through the season. Cosmos are annuals and you could try “Dazzler” and “Purity” or any other variety of course.