You can either collect seeds from your succulent collection or buy them online from a reputable seller. However, they can fall victim to pest infestations, especially if proper plant hygiene guidelines aren't followed. It is important to inspect your plants at least once a week to avoid a boom in pest populations. The more severe the injury, the darker your plants will be. Be careful not to splash water on the stems or leaves of your succulents when fertilizing them. It can cause severe burns. You should choose healthy, mature leaves to fertilize your succulents.