How to treat non-hardy perennial salvia
Hey--I didn't realize there was a salvia forum!
Last year was the inception of my summer border and I tried both the hardy, annual and tender perennial salvias. My culinary salvias are doing very well but I lost other flowering types to the winter and probably to less than optimal drainage during that season.
1.What specifically are you adding to soil to improve drainage? My beds are all native silty loam with some mushroom compost added.
2. I have a large grassy area that only has an inch or so of topsoil on it due to previous owners putting down packed gravel to drive on. If I wanted to make a raised bed for non-hardy salvias, agastache and similar needs plants on this area (full sun) what would the ideal raised bed mix be and how deep to make it above the packed ground?
3. Is there are way to overwinter the tender salvias inside somehow or is it not worth it outside their normal climatic zone?
Thanks for your help.