Yes drainage holes cactus pots are essential and not optional if you want your plants to survive long term. Without holes water pools at the bottom and creates the perfect conditions for deadly root rot. Every cactus pot needs at least one drainage hole to let excess water escape after you water.
I learned this lesson when I put a new cactus in a pretty glazed pot with no holes because it matched my decor. The plant looked great for three months until one day the whole thing flopped over soft and rotten. The roots had been sitting in soggy soil the whole time while the top hid the damage from view.
Good cactus pot drainage keeps oxygen flowing to the root zone where your plant needs it most. Roots breathe just like leaves and they suffocate when water fills all the air spaces in soil. Standing water also invites fungal rot that attacks wet roots fast. These diseases can kill your cactus within weeks if you do not fix the drainage problem.
The cactus container requirements for healthy plants are simple but strict about this one point. Your pot must have holes and you must use soil that drains fast through them. Any container that traps water at the bottom will eventually rot the roots no matter how careful you are. This rule has no exceptions for any species of cactus grown indoors.
Never let your cacti sit in water that collects in saucers beneath the pot after watering. Empty those saucers within 30 minutes so the roots do not soak in standing moisture. If you forget and come back hours later to a full saucer dump it out right away. Better yet use pots that drain into nothing or sit on pot feet that lift them up.
Terra cotta makes some of the best pots for cacti because the porous clay helps moisture escape fast. Water wicks through the pot walls and evaporates into the air around your plant. This extra drying action gives you a safety margin if you water a bit too much. Plastic and glazed ceramic hold moisture longer and need more careful watering.
My collection of twenty cacti all live in terra cotta now after I lost three plants to rot in sealed containers. The clay pots dry out faster and I can see mineral deposits on the outside that tell me when to water. The plants in these breathable pots have healthier roots and grow faster than the ones I kept in plastic.
You can use decorative pots without holes if you try the cachepot method instead of planting direct. Keep your cactus in a plain plastic pot with drainage and slip that whole thing inside the pretty outer pot. Take the inner pot out when you water and let it drain before putting it back inside. This setup gives you style and safety at the same time.
Drilling your own drainage holes works on many ceramic and terracotta pots with the right tools. Use a masonry bit and go slow to avoid cracking the material as you work. Start with a small pilot hole and enlarge it in stages until water flows through freely. One hole the size of a pencil should provide enough drainage for pots up to six inches wide.
Choose a pot size that fits your cactus with only one to two inches of space around the roots. Too big a pot holds excess soil that stays wet after the roots drink their fill. That damp soil sitting unused creates a rot risk even with perfect drainage holes. Match your pot to your plant and size up only when roots fill the current container.
Read the full article: 7 Essential Tips: How to Care for Cactus
