Every summer has its ups and downs: blooms, especially doubles, can get a bit bedraggled in the summer rain, and burst of hot sunshine causes them to go over a bit faster. However, as soon as one plant is past its best, another comes to take its place providing a degree of change that makes gardening so interesting. The perennials look especially good at the moment. Potentilla ‘Monarch’s Velvet’ has small single flowers, but they are rich crimson jewels which top the green foliage. As one of the more vigorous perennials, they provide a good degree of weed suppression.