Parsley (Petroselinum crispum) care

Herbs & edibles · straightforward to keep

Last updated 26 October 2026

Parsley (Petroselinum crispum) wants bright light; a few hours of sun. Water it every 3 days. Keep the compost damp. Parsley has a long taproot and sulks if it dries out. Pot it in rich, free-draining compost. A balanced feed at half strength every two weeks in summer, and repot every 6 months. Humidity: room humidity is fine, with air moving. Toxic to cats and dogs in quantity: the ASPCA lists parsley for furanocoumarins, which can make skin sensitive to sunlight.

Parsley, curly or flat-leaved: a biennial herb usually grown for a season and replaced. Supermarket pots are crowded with seedlings; split the clump into a few smaller pots and it lasts far longer.

Quick facts

Water: Water every 3 days. Keep the compost damp. Parsley has a long taproot and sulks if it dries out.
Light: Bright light; a few hours of sun.
Humidity: Room humidity is fine, with air moving.
Soil: Rich, free-draining compost.
Feeding: A balanced feed at half strength every two weeks in summer.
Repotting: Repot every 6 months.
Toxic to pets: Toxic to cats and dogs in quantity: the ASPCA lists parsley for furanocoumarins, which can make skin sensitive to sunlight. Edible for people. The ASPCA lists Parsley (Petroselinum crispum) as toxic to cats and dogs (checked 26 October 2026).
Difficulty: Straightforward.
Mature size: 20–30 cm.
Native to: The Mediterranean.

Watering a Parsley

Water every 3 days. Keep the compost damp. Parsley has a long taproot and sulks if it dries out.

That cadence is the one PlantParlour sets for this species when you name it, and it is deliberately on the cautious side — a plant that asks a day early is safer than one that asks a day late. Log each watering and the reminder moves with the plant rather than with the calendar.

Light

As much direct sun as possible. Supermarket basil dies indoors mainly because a kitchen windowsill gives it a fraction of the light it needs.

Humidity and temperature

Room humidity is fine, with air moving. Central heating in winter is what turns a comfortable room into a dry one, and it is the usual reason an established plant suddenly browns at the edges or picks up spider mites.

Soil and potting

A rich compost that holds some water but drains freely. The pot a supermarket basil comes in is far too small and far too crowded — split it into three or four pots on day one.

Feeding

A balanced feed at half strength every two weeks in summer. Stop feeding in autumn and start again when you see new growth in spring — feeding a plant that isn't growing just builds up salts in the pot.

Repotting

Repot every 6 months. Basil is an annual. Rather than repotting, take cuttings through the summer and start new plants.

Common problems

Whole plant collapses within a fortnight of coming home
Too many seedlings in one small pot, all competing.

Fix: Split the clump into three or four pots on the day you buy it, and put it in the sunniest spot you have.
Black spots and stems going soft
Fungal disease from cold, damp, still air.

Fix: Water in the morning at the base, improve airflow, and keep it warm.
Flower spikes forming
It is bolting; the leaves turn bitter afterwards.

Fix: Pinch out the flower buds and the top pair of leaves regularly to keep it producing.

Propagation

Cuttings root in a glass of water within a week. This is the practical way to keep basil going year-round.

A cutting taken in PlantParlour keeps its link to the plant it came from, so a propagation years later still traces back to the mother plant — which is the point if you ever sell or trade it.

Toxicity and safety

Toxic to cats and dogs in quantity: the ASPCA lists parsley for furanocoumarins, which can make skin sensitive to sunlight. Edible for people.

The ASPCA lists Parsley (Petroselinum crispum) as toxic to cats and dogs (checked 26 October 2026).

If your pet has eaten a plant, call your vet, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661. Both are open around the clock and may charge a consultation fee. Take the plant or its label with you.

This is general information, not veterinary advice. We don't test plants: what we say about toxicity follows the ASPCA's published plant list as it stood on 26 October 2026, and that list can change. "Non-toxic" means not poisonous — a pet that eats enough of any plant can still vomit, and fertiliser, pesticide or leaf shine on a plant can harm it. It also only helps if the plant is what you think it is. It covers cats and dogs only; ask your vet about rabbits, birds, reptiles or anything else, and a doctor about children. Read our terms.

Every houseplant in the library the ASPCA lists as non-toxic to cats and dogs

Questions people ask

How often should you water a Parsley?

Water every 3 days as a starting point — that is the cadence PlantParlour sets for Petroselinum crispum. Keep the compost damp. Parsley has a long taproot and sulks if it dries out. Light, pot size and the time of year all move that number, so treat it as a reminder to go and check rather than a rule.

How much light does a Parsley need?

As much direct sun as possible. Supermarket basil dies indoors mainly because a kitchen windowsill gives it a fraction of the light it needs.

Is Parsley toxic to cats and dogs?

Toxic to cats and dogs in quantity: the ASPCA lists parsley for furanocoumarins, which can make skin sensitive to sunlight. Edible for people. The ASPCA lists Parsley (Petroselinum crispum) as toxic to cats and dogs (checked 26 October 2026). If a pet has eaten part of a plant, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 straight away.

How do you propagate a Parsley?