They may need to be dug and divided every three or four years. The aromatic foliage can be harvested in early morning and used in a number of ways from repelling moths in the closet to making potpourris, sachets and wreathes. For the landscape, the hybrid Powis Castle is known for its endurance in our heat and humidity. Silver King A. ludoviciana albula has striking lacy foliage making it ideal for arrangements. Another variety of the same species, Silver Queen, is not as large but has finer cut foliage.
Catmints are a group of gray to gray-green much overlooked plants.
The catmints much loved by neighborhood felines produce flowers as pretty as salvias along with their delightful foliage. The ideal site is morning sun and afternoon shade. The plants prefer well-drained beds, so soil preparation is about the same as for the above artemesia. Set out transplants 1 to 2 feet apart and plant at the same depth they are growing in the container. Water and mulch after planting.