I've had success in similar situations by bringing in sand and raising the bed about 4 inches or so. Some bush sages that have been particularly hardy for me have been: S. microphylla San Carlos Festival, S. X Maraschino, S. greggii Wild Thing, S. Raspberry Delight, and for Agastaches Desert Sunrise and rupestris. The herbacious perennial sage Black & Blue just might work for you too. If you are in the Philadelphia area there is a new public garden just across the river at Palmyra Cove Nature Park. We just put in a 400 foot row of the plants you are asking about and added patches of others in various areas around the center. By next year we'll begin to have a clue about which of the many kinds are hardy there. Interested growers will be able to get cuttings to try for themselves.

Wardda

Some areas of my land are clay and other areas are sandy rocky soil if you want to call it that. Due to suggestions from you and because of my conditions for the first time this year I have been playings with raised beds and so far my plants are doing well. I have done this with all my plants, salvias, tomatoes, zinnias etc. For my mix I use scotts select garden soil and a mix of composted cow manure, Thanks Wardda.