Insect and related pests on cacti include aphids, red spider mites and mealy bugs. Make sure newly purchased plants are free of pests before they are added to your plant collection. If insects or mites do become established on your plants, consider using a registered insecticide or miticide to rid the plants of these pests. There are many new selections of types of Christmas cactus to choose from. A good soil mix consists of two parts peat moss, one part garden soil and one part sand.
Good drainage is essential.
Fertilize Christmas cactus plants monthly from the time the plants finish blooming through late spring. Reduce fertilizer during fall and early winter. Christmas cactus should be given less water starting in April or May, and continuing to September. This encourages flower bud formation. Once buds set, more water will be needed.