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How and When to Prune a Cactus


Cacti are low maintenance plants that generally thrive with neglect and do not require a lot of pampering. It might surprise you to find that cacti can and do need to be pruned now and then. Cactus pruning is not always necessary and when to prune a cactus plant will depend upon why you are trimming it. A few notes on how to cut back a cactus for purposes of propagation, rejuvenation and structural integrity will send you on the road to cleaning up your succulents properly.

Can You Trim a Cactus?

New succulent growers may ask, "Can you trim a cactus?" Most cacti really don't need any form of shaping unless they have a great huge limb that looks ready to tip the plant over. The major reasons for trimming cactus are to remove parts to root for new plants, remove offsets or pups for the same reason, reinvigorate a plant that has gotten too tall or too leggy, and to take off damaged material.

Cacti come in a wide range of forms. Cactus pruning can enhance these forms while preventing overcrowding, which can increase the chance of disease, mildew and unhealthy plants. The Opuntias have pads that serve as leaves and these are easy to remove and can be used to start new plants. Columnar plants, like Totem Pole Cacti or Organ Pipe Cacti, may simply get too tall or spindly and require a judicious beheading to force branching or simply thicker stems. Still other cacti will produce flower stalks which are persistent and become ugly when dead. Removal of these will restore the beauty of the plant.

Trimming cactus has a variety of purposes, but the good news is that you can use many of the parts you remove to start new plants.

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How to Cut Back a Cactus

The "how" of cutting back a cactus answers like a bad joke. The simple answer is, very carefully. Most cacti have some type of spine or prickle which can be painful to encounter. Use thick gloves and wear long pants and sleeves for the bigger garden specimens.

The tool will depend upon the size of the plant, but most will succumb to pruners. Only the largest will require a saw. As with all pruning, make sure the tool used is sharp and clean to avoid injuring the plant and decrease the chance of disease.

Remove limbs at the branch point but be careful not to cut into the main stem. Pads or leaves may just snap off or you can use pruners to remove them.

For a big job like cutting back a columnar specimen, use a saw and remove the main trunk at the point at which you would like to see branching or at the height you require the plant. Try to remove the stem at a growth point.

What to Do With Pruned Off Parts

Now for the fun part. Almost all the material you remove is salvageable except for diseased or dead stems and leaves.

  • Pads will root if laid on top of soil and develop into a new plant of the same species.
  • Cut stems and trunks should be allowed to callus at the end for several days and then can be planted to create new cactus.
  • Any offsets or pups that you cut away from the base of a specimen are new plants in their own right and should be potted up immediately.
  • Dead flower stalks and leaves are compost, but some varieties of cactus produce leaves on the flower stem which can be treated the same way as the pads of other species. Most cactus parts will start rooting within a month.

Once you restore your initial cactus to its glory, you will have the pleasure of making more of the spectacular plant and can increase your collection or give them away to family and friends.



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