Cat Grass Vs Catnip Which One Actually Helps With Digestion

Cats have a long-standing fascination with green plants, whether it’s batting at a sprig of catnip or nibbling on blades of grass. For pet owners, this behavior can be both endearing and confusing—especially when your cat eats something, only to vomit minutes later. Is it a sign of illness? Or is there a digestive benefit behind these habits? Two common greens found in homes with cats are cat grass and catnip. While they may look similar and both fall under the “herb for cats” category, their effects on feline physiology are vastly different. One primarily influences behavior, while the other plays a role in gastrointestinal function. So, when it comes to aiding digestion, which one truly delivers?

This article breaks down the biological, behavioral, and digestive roles of cat grass and catnip, compares their nutritional profiles, and clarifies which one supports digestive health—and why.

Understanding Cat Grass: What It Is and How Cats Use It

Cat grass typically refers to young cereal grasses such as wheatgrass, oat grass, barley, or rye, grown specifically for cats to consume. Unlike catnip, cat grass does not contain psychoactive compounds. Instead, it serves a functional purpose rooted in a cat’s natural instincts and digestive needs.

In the wild, felines often ingest plant material after consuming prey. This isn’t accidental; the roughage helps move indigestible parts like fur and bones through the digestive tract. Domestic cats retain this instinct, even without hunting. When given access to cat grass, many will chew on it deliberately, sometimes leading to vomiting—but this isn’t always a cause for concern.

The fiber in cat grass acts as a mild laxative and aids in the passage of hairballs. Additionally, chlorophyll in the grass may support detoxification and freshen breath. Some studies suggest that the act of chewing stimulates saliva production, which can help neutralize stomach acid and reduce nausea.

Tip: Introduce cat grass gradually to avoid overconsumption, which could lead to excessive vomiting or diarrhea.

The Science Behind Catnip: More Than Just a Feline Party Drug?

Catnip (Nepeta cataria) is a member of the mint family and contains a volatile oil called nepetalactone. When inhaled, this compound binds to receptors in a cat’s nasal tissue, triggering a response in the brain’s limbic system—the area responsible for emotions and motivation. The result? Rolling, rubbing, purring, hyperactivity, or even temporary zoning out.

However, once ingested, catnip has a sedative effect rather than an excitatory one. This dual-action mechanism explains why some cats become playful when sniffing catnip but calm down after eating it. But does this translate into digestive benefits?

While catnip has been used historically in herbal medicine for its calming and mild antispasmodic properties, its impact on feline digestion is indirect at best. There is no strong scientific evidence that catnip improves gut motility, reduces inflammation, or assists in breaking down food. Any digestive relief from catnip is likely due to reduced stress—anxiety can exacerbate gastrointestinal issues in cats—but not because the plant itself enhances digestion.

“Catnip’s primary effect is neurological, not gastrointestinal. While it may help relax a stressed cat, it doesn’t actively aid in digestion like fiber-rich plants do.” — Dr. Lena Torres, DVM, Feline Behavior Specialist

Comparing Digestive Benefits: A Direct Breakdown

To understand which plant supports digestion more effectively, it’s essential to compare their composition and physiological impact.

Feature	Cat Grass	Catnip
Primary Active Component	Fiber (cellulose), chlorophyll, vitamins A & E	Nepetalactone (terpenoid)
Digestive Function	Promotes peristalsis, aids hairball expulsion, adds bulk to stool	No direct digestive action; may indirectly reduce stress-related GI upset
Effect When Chewed/Eaten	Induces regurgitation of indigestibles; gentle laxative effect	Sedative; may reduce anxiety but not improve digestion
Nutritional Value	Provides trace nutrients and enzymes	Minimal nutritional benefit
Response Rate in Cats	High—most cats show interest	~50–70%, depending on genetics and age

The data clearly shows that cat grass is the superior choice when digestive support is the goal. Its fibrous structure mechanically assists the gut, while catnip’s influence remains largely behavioral and emotional.

Step-by-Step Guide to Supporting Your Cat’s Digestion with Green Plants

If you're considering adding plant-based support to your cat’s routine, follow this practical guide to ensure safety and effectiveness.

1. Assess Your Cat’s Needs: Does your cat frequently groom and develop hairballs? Do they suffer from occasional constipation or regurgitation? If so, digestive support via cat grass may be beneficial.
2. Choose the Right Plant: Opt for organic, pesticide-free cat grass kits (wheatgrass or oat grass are most common). Avoid ornamental grasses or lawn clippings treated with chemicals.
3. Grow It Safely Indoors: Use a shallow container with potting soil. Sprinkle seeds evenly, keep moist, and place in indirect sunlight. Grass typically sprouts in 5–7 days.
4. Introduce Gradually: Offer a small patch (2–3 inches tall) once or twice a week. Monitor for vomiting, diarrhea, or overeating.
5. Limit Access if Needed: Some cats become obsessive. Rotate availability to prevent overconsumption.
6. Use Catnip Separately for Enrichment: Offer dried or fresh catnip during playtime to stimulate mental activity—not as a digestive aid.

Tip: Rotate between cat grass and safe herbs like parsley (in tiny amounts) to provide variety and additional nutrients.

Real Example: Bella the Longhair and Her Hairball Routine

Bella, a 4-year-old Persian living in Chicago, had a recurring issue with hairballs. Despite daily brushing, she would gag every few weeks, sometimes bringing up large wads of fur. Her owner, Sarah, tried commercial hairball pastes, but Bella resisted taking them.

After consulting her veterinarian, Sarah learned about the benefits of cat grass. She started growing wheatgrass in a sunny kitchen window. Within two weeks, Bella began nibbling on the blades regularly. Over the next month, Sarah noticed a significant reduction in gagging episodes. On the rare occasion Bella did vomit, the expelled mass was smaller and less frequent.

“It’s like she knows when she needs it,” Sarah said. “She’ll eat a little, go lie down, and within 15 minutes, she’s either passed it naturally or brought up just a small bit. It’s been a game-changer.”

This case illustrates how cat grass can serve as a natural, self-regulated tool for managing hairballs—a common digestive challenge in long-haired cats.

Common Misconceptions About Cats and Plant Consumption

Many cat owners assume that any plant-eating behavior is abnormal or a sign of nutrient deficiency. However, research suggests otherwise.

• Myth: Cats eat grass because they’re sick. While illness can cause pica (eating non-food items), regular grass consumption is normal and instinctive.
• Myth: Vomiting after eating grass means it’s harmful. In most cases, vomiting is intentional—a way to clear the stomach of irritants or indigestible material.
• Myth: Catnip helps with digestion because cats eat it. Most cats don’t eat large quantities of catnip; they interact with it olfactorily. Even when consumed, it lacks the fiber needed for digestive support.

A 2008 study published in Applied Animal Behaviour Science observed over 1,000 cats and found that 71% ate plants regularly, with only 27% vomiting afterward. The researchers concluded that plant consumption is a normal feline behavior, not necessarily linked to illness.

Checklist: Choosing the Right Green for Your Cat

Use this checklist to decide whether to offer cat grass, catnip, or both:

• ✅ Does your cat groom heavily? → Provide cat grass for hairball control.
• ✅ Is your cat anxious or under-stimulated? → Offer catnip for enrichment.
• ✅ Has your cat never tried either? → Start with cat grass; it’s safer and more universally beneficial.
• ✅ Are you using store-bought products? → Check labels for additives or pesticides.
• ✅ Is your cat vomiting excessively? → Consult a vet; chronic vomiting is not normal, even with grass consumption.

Frequently Asked Questions

Can cats eat too much cat grass?

Yes. While cat grass is safe, overconsumption can lead to stomach upset or diarrhea. Limit access to a few times a week and replace old growth regularly to prevent mold.

Is catnip dangerous if swallowed?

No, catnip is non-toxic when ingested in small amounts. However, large quantities may cause drowsiness or mild digestive discomfort. Always supervise initial use.

Can I grow cat grass and catnip together?

You can, but keep in mind that catnip may deter other pets or neighborhood cats due to its strong scent. Also, cats might prefer one over the other, so monitor usage to avoid waste.

Final Thoughts: Prioritize Function Over Fun

Catnip has its place—as a source of enrichment, play stimulation, and mild relaxation. But when it comes to tangible digestive benefits, cat grass is the clear winner. Its high fiber content, mechanical action in the gut, and support for natural elimination processes make it a valuable addition to any cat’s environment, especially for indoor cats who lack access to wild vegetation.

Understanding the difference between behavioral triggers and physiological needs allows pet owners to make informed choices. Rather than treating all green plants as interchangeable, recognize their distinct roles: catnip for mood, cat grass for gut health.

💬 Have you noticed changes in your cat’s digestion after introducing cat grass or catnip? Share your experience in the comments—your insights could help fellow cat owners make better choices!