Name: Marilyn Greenwood Village, CO (Zone 5b) Garden today. Clean next week.
I have just put some together and have just kept adding a bit of this and that until it feels right. Mostly the Orchid mix and the little MG moisture and quite a bit of a product called squeegie which is a mix of sand and pebbles.
So far the semps seem to like it OK. Will keep an eye on it as the summer heats up (this weekend in the low 90s)