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Many cats love to nibble on grass, and indoor cats often turn to houseplants instead, some of which can be toxic. Cat grass gives them a safe, fresh alternative. It is usually oat, wheat or barley grass grown from seed, and it sprouts in about a week. The best cat grass kits include everything you need, grow quickly and reliably, and do not make a mess. Below we compare four kits on Amazon and walk you through growing cat grass at home.
Best Cat Grass Kits Compared
| Kit | Grass Type | What’s Included | Best For |
|---|---|---|---|
| SmartyKat Sweet Greens | Organic oat grass | All-in-one container with soil and seed | Best overall, easiest start |
| Pet Greens Self-Grow Kit | Wheat grass blend | Pot, soil and seed | Classic budget kit |
| Organic Cat Grass Kit 3 Pack | Wheat, oat and barley blend | Three grow bags with seeds | Variety and gifting |
| Cat Grass Grow Kit, 4-Batch | Mixed grass seeds | Containers, soil disks and seeds | A steady weekly supply |
1. SmartyKat Sweet Greens Organic Oat Grass Kit — Best Overall
SmartyKat’s all-in-one kit is about as easy as cat grass gets: the container comes with growing medium and organic oat grass seed, so you just add water and put it somewhere bright. Oat grass is soft and sweet, and most cats take to it quickly. It is an ideal first kit if you have never grown cat grass.
- All-in-one, just add water
- Organic oat grass
- Quick to sprout
- Very beginner friendly
Worth knowing: Each kit grows one crop; buy a few to keep a steady supply.
2. Pet Greens Self-Grow Pet Grass Kit — Best Budget
Pet Greens is a long-running brand of pet grass, and its self-grow kit includes a pot, soil and seed. It is widely available and inexpensive, making it a good option to keep on hand. The wheat grass it grows is also popular with dogs that like to graze.
- Affordable and widely available
- Pot, soil and seed included
- Established pet grass brand
- Suitable for cats and dogs
Worth knowing: Wheat grass is slightly tougher than oat grass; some cats prefer one or the other.
3. Organic Cat Grass Kit 3 Pack — Best Variety
This three-pack uses grow bags and a blend of non-GMO wheat, oat and barley grass seeds, so your cat gets a mix of textures. Three kits let you stagger planting for a longer supply, or give one to a friend with a cat. The grow bags are light and easy to place on a windowsill.
- Three kits in one pack
- Wheat, oat and barley blend
- Non-GMO seeds
- Easy to stagger planting
Worth knowing: Grow bags are less sturdy than pots; place them on a tray to catch water.
4. Cat Grass Grow Kit, 4-Batch Indoor Set — Best for Continuous Supply
If your cat eats a lot of grass, this four-batch kit includes containers, compressed soil disks and seeds, so you can plant a new batch each week and never run out. Soil disks expand with water, which keeps setup tidy compared with loose potting soil.
- Four batches for a steady supply
- Compressed soil disks for less mess
- Reusable containers
- Easy weekly rotation
Worth knowing: You may want extra seed once the included batches are used up.
How We Chose These Kits
We compared cat grass kits on ease of setup, grass type, what is included, how many batches you get and owner reviews on Amazon. We do not list prices because they change; use the buttons to see current prices and reviews.
Why Do Cats Eat Grass?
No one knows for sure why cats eat grass. Theories include adding fiber, helping move hair through the digestive tract, and simple enjoyment of the texture. Some cats vomit after eating grass, which is fairly common and usually brings up hair. Cat grass is not a medicine, though. If your cat vomits often, eats grass obsessively, or seems unwell, talk to your vet.
| Grass Type | Texture | Notes |
|---|---|---|
| Oat grass | Soft, sweet | Popular first choice for cats |
| Wheat grass | Slightly firmer | Common in kits and blends |
| Barley grass | Tender | Often part of mixed blends |
| Rye grass | Fine blades | Sometimes included in blends |
Cat grass is not catnip. Catnip is a member of the mint family that causes a playful reaction in many cats. Cat grass is simply cereal grass grown for nibbling.
How to Grow Cat Grass Step by Step
- Prepare the container: follow your kit’s directions to add water to the soil or soil disk until it is evenly damp.
- Sow the seeds: spread them evenly over the surface and press lightly. Some kits suggest a thin layer of soil on top.
- Keep it warm and moist: cover loosely for the first couple of days if your kit suggests it, and mist to keep the soil damp but not soggy.
- Give it light: once sprouts appear, move it to a bright spot out of harsh midday sun.
- Serve it: when the grass is about 4 inches tall, usually 5 to 10 days, offer it to your cat.
- Start the next batch: plant a new container every week or so for a continuous supply.
Keeping Cat Grass Fresh and Safe
- Water lightly at the base every day or two. Overwatering causes mold, which you should never feed your cat.
- Trim yellowing tips and replace the grass when it wilts or flops, usually after two to three weeks.
- Place the pot on a tray or in a heavy holder so it does not tip over.
- Keep cat grass separate from houseplants, and remove any plants toxic to cats, such as lilies, from your home.
- Buy seed sold for pets or sprouting, not lawn seed, which may be treated with chemicals.
Cat grass is one of many ways to enrich an indoor cat’s life. See our guides to the best cat window perches and interactive cat toys, and our new cat checklist.
Our Verdict
The SmartyKat Sweet Greens kit is the best cat grass kit for most people: organic oat grass that grows with almost no effort. The Pet Greens Self-Grow Kit is a great budget option, the Organic 3 Pack adds variety, and the 4-Batch Grow Kit is ideal if your cat is a serious grazer.
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Frequently Asked Questions
Is cat grass safe for cats?
Cat grass grown from oat, wheat, barley or rye seed sold for pets is generally safe. Keep it free of mold and avoid lawn seed that may be treated with chemicals.
How long does cat grass take to grow?
Most kits sprout in two to four days and are ready to serve in five to ten days, when the grass is about four inches tall.
Why does my cat vomit after eating grass?
It is fairly common and often brings up hair. If your cat vomits frequently or seems unwell, talk to your vet.
How long does cat grass last?
Usually two to three weeks. Replace it when it yellows or wilts, and start new batches weekly for a steady supply.
Is cat grass the same as catnip?
No. Catnip is a mint-family herb that makes many cats playful. Cat grass is a cereal grass grown for nibbling.