Is coarse sand necessary in planting S. Officinalis?
In reading Betsy Clebsch's Salvia book she recommends incorporating coarse sand or grit into the soil when planting Salivia Offinalis. She also recommends planting it on a mound.
My soil is well amended (over 30 years) clay.
If I use the sand or grit where would I buy a small amount, what would it be called, and how much do I need?
I've grown salvias before and just put them in well amended soil and they did fine.