National Houseplant Appreciation Day on January 10th reminds you to give your houseplants a little attention to keep them thriving. There is a difference between cacti & succulents, but they are closely related. Succulents are a broader group referring to a type of plant included in several botanical families. Not all succulents are cacti. Succulents store water in their foliage which have a swollen, juicy look. House plants for interior decorating.