For optimal succulent and plant growth, grow lights are required for those without greenhouses. Cacti require direct sunlight, but if your cactus will be kept indoors, you will need to expose it to 12 to 14 hours of full-spectrum light. You will have to rely on the symptoms that appear on the portions of the plant above ground. Hedgehog monkey tail cactus can be found in parts of South Africa. You can remove the slimy, black roots and leave only the healthy ones. These beliefs are what give the plant its name, the money tree. Do you think one of these things is happening to your plant?