Overwatering can cause succulent plant death. This could also result in a dead plant. This plant can grow up to 2 feet tall and 2 feet wide in sunny and warm climates. A south-facing or west facing window will likely require you to place your succulent at least a few feet from the window. However, String of Hearts can be kept directly in a north-facing, or east-facing, window. Although Lithops don’t require much fertilizer, it is possible to give them a little every few months to keep them healthy and strong. Even if it isn't summer, the aeoniums go through the same dormancy process.