Why Do Cats Eat Grass?

Short answer: eating small amounts of grass is a common cat behaviour, but the reason is not fully understood. Proposed explanations include instinctive foraging and helping move swallowed material through the digestive tract. Grass is not a treatment, and repeated vomiting or digestive changes should be discussed with a veterinarian.

Is it normal for cats to eat grass?

Many indoor and outdoor cats nibble grass. International Cat Care notes that the behaviour is common while its exact purpose remains uncertain. A cat may occasionally vomit after eating grass, but frequent vomiting, appetite changes, lethargy or discomfort are not something to dismiss as normal.

Indoor cat grass versus outdoor plants

Purpose-grown cat grass gives indoor cats a known plant to investigate. It is different from allowing a cat to chew unidentified lawn plants or houseplants. Some ornamental plants are toxic to cats, and outdoor grass may have been exposed to pesticides, fertilisers or animal waste.

Check plants against a reputable resource such as the ASPCA toxic and non-toxic plant list. For general behaviour background, see International Cat Care’s explanation of why cats eat grass.

How to grow cat grass indoors

1. Use seeds and growing material intended for a cat-grass system.
2. Follow the pack directions for water, drainage, light and harvest time.
3. Keep the tray in a bright, ventilated place without harsh conditions.
4. Avoid overwatering, which can encourage mould.
5. Offer the grass under supervision and replace it when it becomes old, slimy or mouldy.

A soil-free cat grass option

The MICHU Soil-Free Cat Grass Growing Kit is an Australian-made indoor system designed to grow cat grass without loose potting soil. If you already have the reusable pot, the MICHU Cat Grass Seed & Mulch Refill contains seeds and growing mulch for the next crop.

Frequently asked questions

Does cat grass help with hairballs?

Some theories connect grass eating with moving swallowed material, but this is not a proven treatment for hairballs. Persistent coughing, retching, vomiting or constipation needs veterinary advice.

Can cat grass make a cat vomit?

Some cats may vomit after eating grass. Repeated vomiting, blood, pain, appetite loss or other changes require veterinary attention.

How do I prevent mould on cat grass?

Use clean equipment, avoid excess water, provide ventilation and follow the kit directions. Discard the crop if mould develops.

Is wheatgrass the same as cat grass?

“Cat grass” is a general retail term for certain grasses grown for cats and may include wheat, oat, barley or rye varieties. Check the specific seed pack for its contents.

Can I give my cat lawn grass?

It is safer to avoid grass that may contain chemical residues, sharp seed heads, parasites or contamination. Purpose-grown indoor cat grass gives you more control over the growing conditions.

This guide provides general information and is not veterinary advice.