Identium
How to Prune Houseplants: Where to Cut and Why It Makes Them Bushier
Cutting a plant makes it fuller, not smaller. Once you know why, the rest is obvious.
Most people never prune a houseplant, because cutting a living thing you are trying to keep alive feels wrong. So the plant gets longer and thinner and barer, and eventually looks like a piece of string with four leaves on it.
Pruning is how you get the opposite. Here is the mechanism, which is the only part worth understanding, and then everything else follows.
Why cutting makes a plant branch
The growing tip of a stem produces a hormone that suppresses the dormant buds further down. This is called apical dominance, and its purpose in the wild is to make the plant grow up towards light rather than sideways.
Remove the tip and that suppression stops. The dormant buds below the cut wake up and each produces a new shoot. One stem becomes two or three.
That is the whole thing. Cut the tip, get branching. Which is why a leggy pothos pruned back at four points becomes a full plant a few months later.
Cut just above a node. New growth comes from the node below your cut, so cutting mid-stem leaves a bare stub that dies back.
Rule of thumbWhere exactly to cut
Find a node, the small bump on the stem where a leaf joins or once joined. Cut about half a centimetre above it, on a slight angle so water runs off.
Cutting in the middle of a bare stem between nodes leaves a stub that has no bud to grow from, so it browns and dies back to the next node anyway. Not fatal, just untidy.
Use clean, sharp scissors or secateurs. Wipe the blades with rubbing alcohol between plants, since several plant diseases pass on blades. Blunt scissors crush rather than cut, which heals badly.
What to prune, in order of priority
- Dead, yellow and diseased material. Always, any time of year. It is doing nothing and the plant is still spending on it.Anytime
- Leggy stems with long gaps between leaves. Cut back by up to a third and it branches. This is the main cosmetic reason to prune.Spring and summer
- Anything growing in the wrong direction, crossing, or pressed against a wall.Anytime
- Flowered stems once the flowers are spent, unless you want seed.After flowering
- The very top of a plant that has hit the ceiling. Topping makes it branch out sideways instead.Spring
- Overgrown roots when repotting. Trimming circling roots is pruning too, and it stops the plant strangling itself.At repotting
When
Early spring is best for anything significant, because the plant is about to put on growth and will fill in quickly. Through summer is fine.
Avoid hard pruning in late autumn and winter. The plant is barely growing, so cuts sit open and the branching you wanted does not happen until spring anyway.
Dead material is the exception. Remove that whenever you see it.
How much is safe
A third at a time is a sensible ceiling for most houseplants. Leaves are how the plant makes food, so removing too many at once leaves it unable to power the recovery you just asked for.
If a plant is badly overgrown, prune a third now and another third in a couple of months rather than doing it in one go.
The exception is when you are cutting away rot or disease, where you take whatever is affected regardless of proportion, and then reduce the remaining leaves to match the roots that survived.
The plants not to prune this way
Single-crown plants. Orchids, bromeliads, most palms and ferns grow from a central growing point. Cut that out and the plant does not branch, it stops. Remove dead fronds and spent flower spikes only.
Snake plant. Leaves grow from the base and do not branch. A trimmed leaf stays trimmed and looks it. Remove whole leaves at soil level instead.
Cacti and most succulents. Different rules. You can behead and re-root them, which is how you fix a stretched succulent, but routine trimming does not make them bushier.
Anything already stressed. A plant recovering from rot, pests or a move does not have the reserves. Fix the problem first, prune when it is growing again.
Do not waste the cuttings
For pothos, philodendron, monstera, tradescantia and hoya, every prunable stem tip is a free plant. Cut below a node, root it in water or straight into moist mix, and put three or four back into the parent pot to fill it out.
That is the trick behind those dense shop-bought plants: several rooted cuttings in one pot rather than one plant that grew that way.
Whether your plant branches when cut or grows from a single crown depends entirely on the species, and getting that wrong is the one way to do real harm here. Photograph it and Identium will tell you which type you have before you pick up the scissors.
Frequently asked questions
Does pruning make houseplants bushier?
Yes, and the mechanism is apical dominance. The growing tip produces a hormone that suppresses dormant buds below it. Remove the tip and those buds wake up, so one stem becomes two or three. This is why a leggy pothos cut back at several points fills out into a dense plant within a few months.
Where should I cut when pruning a plant?
About half a centimetre above a node, the small bump where a leaf joins the stem, at a slight angle. New growth comes from the node below your cut, so cutting mid-stem between nodes leaves a bare stub that browns and dies back anyway.
How much of a plant can I prune at once?
Up to about a third for most houseplants. Leaves are how the plant produces energy, so removing too many at once leaves it unable to power its own recovery. For badly overgrown plants, take a third now and another third a couple of months later rather than doing it all at once.
Which plants should not be pruned?
Anything growing from a single central point: orchids, bromeliads, most palms and ferns. Cutting the growing point out stops the plant rather than making it branch. Snake plants also do not branch, so remove whole leaves at soil level rather than trimming their tips.
When is the best time to prune houseplants?
Early spring, as growth restarts, so the plant fills in quickly. Summer is fine too. Avoid hard pruning in late autumn and winter, when the plant is barely growing and the branching you wanted will not happen until spring. Dead or diseased material can be removed at any time.