Great for the wildlife garden because it provides excellent biodiversity spiraea x billardii is a deciduous shrub with many different attributes this beautiful plant is unmistakable in july and august when it displays panicles of fluffy pink flowers which attract beneficial insects spiraea x billardii is really easy to grow too it likes sunshine and looks at home near the back of a border or even in a naturised hedge where it will allow you to forget it is there until the pink blooms provi