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Cat grass for indoor cats: a tray, not a full plan

Updated: 21 October 2026

Your cat lives indoors, or comes in and then chews the houseplants, and you are wondering whether cat grass for indoor cats is worth the compost. A pesticide-free tray is a safer nibble than a sprayed lawn or a lily. It does not finish the job of keeping an indoor cat, and it does not make the other plants in the room harmless. This page is that limit. Which pot to order is on the [cat grass plant comparison](/hub/houseplants/cat-grass-plant). Peter F. checked the listings against public UK charity pages. This is not a lab test. A qualifying purchase through our amazon.co.uk links can earn a commission at no extra cost to you.

Your cat lives indoors, or comes in and then chews the houseplants, and you are wondering whether cat grass for indoor cats is worth the compost. A pesticide-free tray is a safer nibble than a sprayed lawn or a lily.

Our top picks

Webbox Webbox wheatgrass kit

Best overall

Webbox Webbox wheatgrass kit
8.8/10about £6.10
View offer
Cat Mommy Cat Mommy one 12 cm pot

Rank 2

Cat Mommy Cat Mommy one 12 cm pot
7.6/10about £10.99
View offer
Carbeth Plants Carbeth Zumula 13 cm pot

Alternative

Carbeth Plants Carbeth Zumula 13 cm pot
7.8/10about £11.49
View offer
On this page
  1. 1.Why an indoor cat chews leaves
  2. 2.What a tray of cat grass changes
  3. 3.Lilies and the lists that disagree
  4. 4.When grass eating is a vet visit

Why an indoor cat chews leaves

Cats Protection says cats with no outdoor access still seek grass, and that chewing houseplants is a reason to offer some. Their account includes boredom as well as the hairball story. PDSA says the reason is unsettled, grazing is common, and it is not proof of a missing nutrient. A Countryfile piece quoting a PDSA nurse says the same. Frantic grazing, or a cat that will eat only grass, needs a vet. Blue Cross does not treat indoor-only life as the life they recommend. A wheatgrass pot does not settle that. Webbox reviews often mention indoor cats eating the result. That is a tray pattern, not a garden replacement. The 2025 Cats Protection leaflet says offer cat grass to chewers who cannot go out, and never keep lilies. The lily still has to leave.

What a tray of cat grass changes

Blue Cross suggests a tray so the cat is not eating sprayed grass. PDSA says weedkiller makes an otherwise fine plant unsafe. None of these seven listings has an organic mark. No nasty chemicals is seller wording, not a certificate. A Webbox kit is the resow if you can wait. A ready cereal pot is tonight's nibble, often for days rather than a season. Zumula is the longer green if you accept the sharp-blade warning on wheatgrass versus Zumula. None of them makes a lily safe. Pollen, petals, leaves and vase water are part of the Lilium and Hemerocallis problem. Too much grass can make a cat vomit, Blue Cross says. Take the tray up if the cat is gorging. That is not a hairball remedy. GOV.UK says pet-food claims must be provable and not medicinal.
Webbox Webbox wheatgrass kit

Testsieger

Webbox Webbox wheatgrass kit
8.8/10about £6.10
View offer

Lilies and the lists that disagree

Blue Cross lists Lilium and Hemerocallis as a kidney risk from any part, including pollen. Cats Protection says never keep them and never leave vase water out. Pollen on the cat is a same-day vet call. Do not offer cat grass as the antidote, and wash only if a vet has told you how. The charities disagree on spider plant. Blue Cross lists it as poisonous but less so than lilies. Cats Protection includes it on a safer list. Do not call it a safe substitute. Move it if the cat is shredding it. Aloe vera, monstera and snake plant are on Cats Protection's dangerous list. Grass beside an aloe does not neutralise the sap. Bin a fly-blown pot. Watering the next one is on how to grow cat grass.

When grass eating is a vet visit

See a vet if vomiting is frequent, the cat is flat or in pain, you suspect a lily, or grass is stuck in the nose or a seed is in the ear, eye or paw. PDSA treats a gut blockage as urgent. One vomit after a binge fits Blue Cross. Repeated vomiting does not. Cats Protection says do not pull a stem lodged in the nose. The tray does not finish indoor life. Blue Cross's indoor-cat page is about space, play, boredom and weight. A 12 cm pot does not answer those. This page compares amazon.co.uk listings. It is not a clinic.

Common questions

Do indoor cats need grass?
They often seek it. Cats Protection suggests offering cat grass to chewers, especially with no outdoor access. PDSA says the reason is unsettled and that grazing is normal, not automatic proof of a deficiency. Need is too strong a word. A tray is a reasonable offer. It is not a prescription, and a cat that eats only grass should see a vet rather than receive a bigger pot.
Will cat grass stop my cat eating the lily?
It might give the cat something else to chew. It does not make the lily safe. Any part of a lily, including pollen and vase water, is an emergency risk in Blue Cross and Cats Protection advice. Remove the lily. If the cat has already touched it, call a vet the same day. Do not wait to see whether the new tray wins the cat's attention.
What if there is lily pollen on the cat?
Treat it as urgent veterinary care. Pollen is enough to matter on the charity pages, and a cat that grooms will swallow more. Do not rely on cat grass, milk or a wait-overnight plan. Ask the vet before you start bathing, so you do not spread pollen while you try to help. The grass pot can wait on the side.
Is spider plant a safe substitute?
Do not call it safe. Blue Cross lists spider plant among plants that are poisonous but less so than lilies. Cats Protection includes it on a safer list. Those are both UK charity pages, and they conflict. Offer a cat-grass tray instead of deciding the spider plant is harmless. Move the spider plant if it is being shredded. Do not treat it as seriously as a lily unless a vet tells you this cat is ill from it.
My indoor cat vomits after grass. Is that the point?
No. Blue Cross says too much grass can cause vomiting, and PDSA says frequent vomiting needs a vet. A seller's hairball claim is not a result. One vomit after a binge is a reason to limit the tray. Vomiting that continues, or a cat that is quiet and off food, is a reason to call the vet. Do not buy another kit to make a remedy work.

Related pages

Cat grass plant buying guide

Cat grass plant

Best cat grass plant in the UK: top pick and value

How to grow cat grass: sow, water, and avoid mould

Wheatgrass vs cat grass plant: soft blades or sedge

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these seven listings are the snapshot in the comparison files. A live check on 19 October 2026 had the Webbox kit nearer £6.58. Page updated 21 October 2026.

  1. PDSA, weird things cats do (retrieved 19 October 2026)
  2. PDSA, vomiting in cats (retrieved 19 October 2026)
  3. Blue Cross, why cats eat grass (retrieved 19 October 2026)
  4. Cats Protection, why cats eat grass (retrieved 19 October 2026)
  5. Cats Protection, keeping your cat safe (2025) (retrieved 19 October 2026)
  6. GOV.UK pet food (retrieved 19 October 2026)
  7. Consumer Rights Act 2015, section 19 (retrieved 19 October 2026)
  8. Zooplus Magazine, cat grass (retrieved 19 October 2026)