This huge genus of flowering plants (Crassulaceae family) has over 600 species in the Northern Hemishere. Commonly aka stonecrops, they vary from tiny, to low and creeping, to shrub-sized plants. Drought tolerant, they store water in their leaves. They grow well with other succulents and I use them in almost all of my plantings… to fill in, plump up, and spill over the sides of containers.