Make sure they have excellent drainage, most like lean (not fertile) soil with sand (not play sand) and crushed gravel on top of the soil and full sun to mostly sunny. I always add small crushed gravel in the planting hole as well,
Agastaches don't like their roots wet during the Winter.
I'm pretty sure Raspberry Summer isn't as finicky as most Agastaches.
Terra Nova's site... " Easy to grow as long as it has full sun and good drainage."
http://www.terranovanurseries....
http://www.missouribotanicalga...
