At the moment horticultural fashion is focused on herbaceous perennials and the naturalistic planting movement. Some 'plants people' are calling for change and singing the praises of woody plants, which I am in favour of. But on this occasion, I want to focus on annuals and biennials. I am not advocating a return of carpet bedding as you may find in your local park. I use annuals as a quick and economic way to fill in gaps and top up summer colour in a mixed border.