Greg, I was wondering how adding grit as a top dressing helps drainage. I just planted several large planters with semps and sedum and am trying to figure out if I should top dress them. I'm afraid I won't be able to see the soil when it gets dry. Living in a humid climate, I'm struggling with the best mix and watering techniques, especially since things are just starting to root in. (I know I put waaaay too many semps in each pot.)
