Our main rock garden is on a slope behind our house. We began building it shortly after the house was finished in 2002. The slope faces west and is in the sun for most of the day. The soil is classic foothill red clay, somewhat supplemented by occasional shovels of sand and a gritty top soil mix. The mulch is pea gravel, whatever kind we have piles of at the time, and ranges from 1 to 8 inches deep. 3-4 inches would be perfect and is my target goal.
The garden is watered about once a week in the summer. Peak bloom is in April, with subsequent waves peaking again in May and June.

