Recently, a succulent pest discovered that leaves were covered with raised bumps and was causing them to turn brown. Use a pair of sharp, clean pruning shears to follow the leaves to the main stem. I recently took you to a newly renovated collector’s garden north San Diego. This garden is a favourite of mine, having been my favorite since 2008. Topdressing is necessary for succulent gardens. Topdressing can be done in several ways. Begin by placing rubble rock along the borders of pathways.