By Kimberley Hall Wondering how to fertilize a cactus plant can present a bit of a dilemma, because the first question that comes to mind is “Does a cactus need fertilizer, really?” Keep reading to find out and learn more about fertilizing cactus plants. Does a Cactus Need Fertilizer? The classic perception of the perfect environment for cacti is a harsh, dry desert with two extremes: periods of no rainfall whatsoever or sudden deluges that the plant must absorb, store and use throughout the next dry spell. It’s important to remember that whether they are outside in the garden exposed to seasonal extremes or in a bright sunny spot in the house, fertilizing cactus plants can keep them happily growing no matter the season. Just like with any other garden or houseplant, fertilizing cactus plants will help them adapt, actively grow and even multiply if that’s one of their characteristics.