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Cacti don’t have an extensive root system. They’re happy to stay in the same pot for a while. This guide to repotting cacti will give you details including why, when, how, and more.
Your cactus should go into a slightly larger pot than the old pot it’s currently growing in. If cactus are in too large of pot they are subject to holding more water and staying too wet which can lead to root rot.
I recommend buying pots with at least 1 drain hole on the bottom of the pot especially if you’re new to cactus care. Pots without holes are prone to the soil mix staying too wet.
The best time to do the repotting is in spring and summer. Early fall is fine too if you’re in a climate with milder winters.
Cactus plants don’t need frequent repotting. Depending on the size of the cactus every 3 – 6 years will be fine. After 5 years or so, I figure it’s a good idea to replace the old soil with new soil to freshen things up.
Cacti in any sized pot do best in a special potting mix. To sum it up, the mix you plant them in should be well aerated and light, and most importantly have good drainage.
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