PlantRx

ZZ plant not growing

By Karim DiabatePublished Updated How these guides are built

A zz plant that has stopped growing is not necessarily unwell. Growth is seasonal, and some plants are simply slow. The question worth answering first is whether this is a stall or a decline, because they need opposite responses.

A healthy ZZ Plant, photographed for reference
A healthy zz plant for comparison. This is a reference photo, not a picture of the problem. Photo by User:WeFt (CC BY-SA 3.0), via Wikimedia Commons.

First: this is often normal

On a zz plant this is often normal: months with no visible new growth, especially outside spring and summer. Rule that in or out before changing anything about how you care for it.

What is specific to this plant

  • A ZZ plant stores water in rhizomes that look like small potatoes, so it can go a month or more without water. Almost everything that kills one is too much water, not too little.
  • It grows slowly by design. A ZZ that has not visibly changed in months is usually not sick.
  • Because the rhizome buffers the plant, symptoms appear late. By the time leaves yellow, the rot has usually been going on for weeks.

What it could be, and how to tell

These look alike in a photograph, so each one below lists what you would ALSO see if that is the cause. Work down the list and stop at the one where the other symptoms match too.

most common

1. Growth that arrives as whole stalks, months apart

What else you would see

  • no change at all for months, then several new stalks at once
  • new stalks emerging from the mix already formed, rather than existing ones lengthening
  • the existing stalks unchanged and in good condition
  • a plant that has been in the same pot for a long time
How to confirm it: Look for new stalks coming out of the mix rather than for movement in the ones you have. A ZZ does not extend its existing stalks, it pushes entirely new ones from the rhizome in occasional flushes, so months of no visible change is how the plant normally behaves. A healthy ZZ that has done nothing since spring is resting, not stalled.

What to do

  1. Leave it alone and judge growth over a year rather than over a season.
  2. Give it brighter indirect light if you want more frequent flushes, which is the one thing that reliably increases them.
  3. Do not increase watering to force growth, which is how a resting ZZ is turned into a rotting one.
common

2. Not enough light

What else you would see

  • long bare stretches of stem between the leaves
  • each new leaf smaller than the last
  • lower leaves shed while the growing tip carries on
How to confirm it: Stretched growth and shrinking new leaves together, on a plant whose watering is otherwise right. ZZ plant wants anything from low to bright indirect.

What to do

  1. Move it to anything from low to bright indirect.
  2. Cut back the stretched growth. It will not compact again on its own, and cutting back is what triggers branching.
  3. Turn the pot every couple of weeks so it grows evenly.
common

3. The season

What else you would see

  • the pause started in autumn and has continued through winter
  • the existing leaves look healthy and are not dropping
  • shorter days and lower light than in summer
How to confirm it: Healthy foliage plus no new growth, between autumn and early spring, is a resting plant. Almost nothing grows meaningfully indoors in midwinter, and pushing it with fertiliser then does harm rather than good.

What to do

  1. Wait for spring. Reduce watering to match the lower demand.
  2. Do not feed a resting plant. Fertiliser it cannot use accumulates as salt in the mix.
less common

4. Rootbound, or soil that is worn out

What else you would see

  • roots circling the inside of the pot or escaping the drainage holes
  • water running straight through with almost no absorption
  • two or more years in the same pot, and smaller new growth each season
How to confirm it: Lift the plant out and look. A dense mat of circling roots with very little mix left means the pot can no longer hold what the plant needs.

What to do

  1. Repot one size up in spring into fresh gritty, free-draining mix, teasing the outer roots loose.
  2. Feed during the growing season, following the instructions on the label of whatever you buy.
less common

5. Nothing left in the mix

What else you would see

  • two years or more in the same mix with no feeding
  • pale new growth that is smaller than the old growth
  • water running straight through a mix that has shrunk in the pot
How to confirm it: Uniform pallor in the newest leaves, on a plant that has not been repotted or fed for a long time and has enough light.

What to do

  1. Repot into fresh gritty, free-draining mix in spring.
  2. Feed during the growing season only, following the label on the product you buy.
uncommon

6. Roots damaged by overwatering

What else you would see

  • yellowing that starts on the lowest, oldest leaves and works upward
  • stems soft or dark at the soil line, sometimes with a sour smell
  • soil or mix still wet several days after watering, when this much should have dried: at least the top half of the pot, and ideally nearly all of it
  • small flies around the pot, which breed only in constantly wet soil
How to confirm it: Slide the plant out of its pot and look at the roots. Healthy ones are thick potato-like rhizomes, firm to the touch. Brown, soft, or hollow when you press them means rot, and that changes what you do next completely.

What to do

  1. Stop watering and let it dry down this far: at least the top half of the pot, and ideally nearly all of it.
  2. Check that the pot drains and empty any saucer or decorative outer pot it sits in. Water held out of sight keeps the mix wet whatever you change above it, and it stays invisible until you lift the pot.
  3. If the roots are soft and brown, trim them back to firm tissue with a blade sterilised first and repot into fresh gritty, free-draining mix.

Common questions

How fast should a zz plant grow?

It varies enormously by species and by season. The useful comparison is against the same plant last spring, not against someone else's. A plant that grew well last summer and has paused in December is behaving normally.

Will fertiliser make it grow?

Only if a nutrient shortage is what is holding it back, which is much rarer than it is assumed to be. Feeding a plant that is short of light does nothing useful and builds up salts in the mix.

Should I repot to encourage growth?

If it is genuinely rootbound, yes. If there is still mix and room in the pot, no. Moving a plant into a much larger pot slows it down, because the extra wet mix nothing is drinking from is where rot starts.

Is a zz plant poisonous to cats, dogs or children?

ZZ plant contains calcium oxalate crystals and is widely listed as harmful to pets and children if chewed. We do not tell you that any plant is safe. If a pet or a child may have chewed any part of one, contact a vet, or Poison Control on 1-800-222-1222 in the US, immediately rather than waiting to see what happens.

Before you act on any of this

This is general plant care guidance for a plant, not advice about people or animals. We never tell you whether a plant is safe to eat or touch, and we never tell you a plant is safe for a child or a pet. If a child or animal may have eaten any part of a plant, contact Poison Control (US 1-800-222-1222) or a vet immediately rather than reading further.

Treatment advice here is deliberately category level. We do not give product names, mixing ratios or application intervals. Whatever the label on the product in your hand says is the instruction that counts, and following it is your responsibility.

Where this comes from

The general horticultural facts behind this differential come from published university extension and Royal Horticultural Society guidance. What is specific to this plant, and the order the causes are ranked in, is ours, and the methodology page says where that reasoning stops being reliable.

Other zz plant problems

Not sure which one it is?

PlantRx is an iPhone app that reads the photo and gives you the same kind of ranked differential you just read, for your plant specifically, with the evidence it based each answer on. The first diagnosis is free, in full. There is no subscription and no account.

More about PlantRx