Zz plant curling leaves?

Curling ZZ plant leaves usually mean the plant is short of usable water, either because the mix is too dry, the roots are staying too wet, or the plant is stressed by sun, temperature, pests, or chemicals.

Answer what you can see

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Push a finger two inches into the soil. What does it feel like?

Which leaves are affected?

Where does it live?

How fast did this happen?

Some causes can share the same answers, especially dry soil, hot window sun, pests, and fertiliser or spray damage; use the confirm checks to separate them before acting.

The causes in full

Pot stayed dry too longMOST COMMON

How to tell
The pot feels very light, the mix is dry deep down or has pulled away from the pot, and the leaf stalks may look slightly wrinkled rather than soft or mushy.

What to do
If the potting mix is dry all the way through, water slowly until water runs from the drainage holes, then empty the saucer. Do not water again until the potting mix is dry all the way through.

Waterlogged soil and root rotCOMMON

How to tell
The soil stays damp or wet for many days, the pot may smell sour, and lower stalks may feel soft at the base instead of firm.

What to do
If the potting mix is not dry all the way through, do not water again until the potting mix is dry all the way through. If stems are soft or roots are brown and mushy, unpot the plant, cut off mushy roots, and repot into a pot with drainage and a chunky, fast-draining mix.

Hot direct sun through glassCOMMON

How to tell
The curling is worst on the window-facing side, often with pale, tan, or crisp patches where the glass sun hits the leaves.

What to do
Move the plant out of direct sun through glass, or filter the window with a sheer curtain. If the potting mix is dry all the way through, water thoroughly, then wait until the potting mix is dry all the way through before watering again.

Cold draught or cold window shockLESS COMMON

How to tell
Curling started soon after a cold night, open window, air-conditioner blast, or leaves touching cold glass.

What to do
Move the plant away from cold glass, draughts, heaters, and air-conditioner vents, and keep it in steady room warmth. Keep watering only when the potting mix is dry all the way through.

Spider mites, thrips, or mealybugsLESS COMMON

How to tell
Look closely under leaves and along stems for fine webbing, tiny moving specks, silvery streaks, sticky spots, or white cottony clumps.

What to do
Isolate the plant, wipe leaves and stems clean, and treat with a labelled insecticidal soap or horticultural oil; do not use dish soap as a substitute. Repeat as the product label directs, because one treatment rarely catches newly hatched pests.

Fertiliser or leaf-shine spray damageRARE

How to tell
The curling began soon after feeding, using leaf-shine spray, or spraying leaves in bright light, and you may see brown tips, a crust on the soil, or a greasy shine on leaves.

What to do
Stop fertilising or using leaf-shine products, and wipe residue from the leaves with a damp cloth. If overfeeding is likely and the potting mix is dry all the way through, water thoroughly to flush the mix; if it is not dry all the way through, repot into fresh fast-draining mix instead of adding more water.

Will it recover?

Leaves curled from thirst often relax after correct watering, but leaves that are scorched, yellowed, mushy, or badly creased may not fully recover, so judge success by firm new growth.

Stopping it happening again

Grow ZZ plants in a pot with drainage and bright indirect light, keep them out of hot glass sun and cold draughts, check pests during watering, and water only when the potting mix is dry all the way through.