I have had problems with cana and aurantiaca in really hot and dry conditions. For they just don't survive long in those conditions, conditions where Salvia greggii & microphylla experience no problems. This was entirely unexpected and it has led me to give up growing them. The only reliably hardy Agastache for me in dry sandy never watered conditions is rupestris and hybrids of rupestris. Cana and aurantiaca seem to only go as annuals or very short lived perennials.
