How Much Succulent Soil Do You Need? You will need to clean the plant with a sink, and then place a sticky trap on the bottom. Indoor plants are less vulnerable to pest infestations but can still become infested. This is why we think you may be interested in further investigating this plant. You don't need to worry about hurting the plant this way, but it might be less aesthetic if it has patchy foliage. You can simply remove any pests, treat the plant using an organic or homemade insecticide, and then wait. Christmas cactus can be more vulnerable to pests than many other species.