Note that some succulent varieties are more active and will grow in winter while others will go dormant throughout the summer. Crassula Ovata 'Crosby's Dwarf' can still suffer from sunburn even when acclimated to full sun during a heatwave or when the temperature gets intensely hot in the summer months. Although they are not very attractive, sunburned brown spots can cause permanent damage to the plant's leaves. It is best to choose uniformly colored leaves, free of spots, marks, discoloration and spots. They are native to South Africa and Mozambique.