This is a low-growing bushy perennial from a desert habitat in Mexico. It is about 30cm tall with small silvery leaves and sky blue flowers from late spring until autumn. It is very drought tolerant and makes a good edging along sunny paths - it suckers a bit from its roots, but not to the extent of being a nuisance. It is a pretty under-planting for roses or can be grown with other drought-proof plants such as lavender, rosemary, perennial wallflower (Erysimum species), sedum, bearded irises, Artemisia and Verbena. It may sulk if it is not grown in a hot, dry position. It doesn't like a lot of humidity. It is frost tolerant. It is best to cut it back quite hard in May.