Cat Grass, Cardboard Boxes, and Other Simple Joys

A new toy can arrive in a carefully designed package, only for the cat to ignore the toy and climb into the delivery box.

A pot of grass can become a place to sniff, nibble, and rub the face. A plain cardboard scratcher can be more satisfying than an elaborate tower. A safe piece of natural bark or wood texture may invite investigation and scratching.

These are not failed purchases or silly reactions. Cats often value what an object allows them to do:

• hide;
• observe without being exposed;
• scratch and stretch;
• investigate scent;
• chew a safe plant;
• ambush a toy;
• sit inside a boundary;
• leave familiar scent;
• choose when to participate.

Simple enrichment works when it matches a real feline behaviour. It does not have to be expensive, electronic, or permanently available.

Enrichment is an opportunity, not a performance

The purpose of enrichment is not to make a cat look busy for a video. It is to provide safe opportunities for choice and species-typical behaviour.

One cat may leap into every new box. Another may watch it for three days. One chews cat grass. Another sleeps beside it. One scratches a bark surface. Another prefers cardboard.

Those are all responses.

Do not push a cat into a box, rub grass on the face, move the paws across wood, or repeatedly present an object after the cat leaves. Choice is part of the benefit.

A useful item can offer:

• an approach and an exit;
• a stable surface;
• no forced social contact;
• enough room for the intended behaviour;
• a location where the cat feels safe;
• novelty without overwhelming noise or movement.

Cat grass is not one special plant

“Cat grass” usually refers to young cereal grasses grown for pets, commonly:

• oat;
• wheat;
• barley;
• rye.

It is different from catnip. Catnip is a herb that can trigger a temporary behavioural response in susceptible cats. Cat grass is usually offered for nibbling and sensory exploration.

Buy seeds or a growing kit that clearly identifies the plant. An unlabelled tray of “pet grass” provides little ability to check safety.

Do not collect roadside, lawn, or garden grass for an indoor cat. It may contain:

• pesticides or herbicides;
• fertiliser;
• parasite eggs;
• animal waste;
• sharp seed heads;
• toxic weeds;
• mould;
• vehicle or chemical contamination.

Why do cats eat grass?

There is no single proven explanation for every cat.

Possible reasons include:

• taste or texture;
• exploratory behaviour;
• a familiar inherited behavioural tendency;
• sensory stimulation;
• movement of plant material through the digestive tract;
• individual preference.

A study of plant-eating behaviour found that many cats ate plants without appearing ill beforehand. This does not support the simple claim that cats always seek grass because they need to vomit.

Some cats do vomit after eating grass, but vomiting is not the goal to encourage. Repeated vomiting, appetite change, diarrhoea, constipation, weight loss, lethargy, or frantic plant eating needs veterinary assessment.

Cat grass does not:

• cure hairballs;
• treat parasites;
• correct an incomplete diet;
• detoxify the body;
• replace veterinary care;
• make toxic houseplants safe.

Texas A&M veterinary guidance describes cat grass as an optional item many cats enjoy, not a requirement when the cat eats a balanced diet.

Offer cat grass safely

Choose a stable container

A cat may pull hard, step into the tray, or knock it over. Use a broad, stable, non-breakable container without sharp edges.

Avoid decorative glass pots and lightweight containers that tip onto the cat.

Use suitable growing material

Follow the seed supplier's directions. Avoid fertiliser, pesticide, moisture crystals, decorative stones, cocoa mulch, essential oils, and unknown soil additives.

Do not let the cat dig into or eat potting material. A mesh or purpose-made cover can protect the growing base while allowing grass through.

Prevent mould

Dense grass and damp soil can develop mould, especially in a warm, humid home.

Provide drainage, avoid constant soaking, remove dead material, and inspect the base and smell daily. Discard the entire tray if it becomes slimy, sour-smelling, fuzzy, insect-infested, or mouldy.

Washing the visible blades does not remove contamination from the roots and growing medium.

Retire sharp or mature growth

Young soft blades are different from mature grass with stiff stems, sharp seed heads, or awns. Replace the tray before it becomes coarse or develops seeds.

Start with short access

Supervise the first sessions. Some cats take a few bites; others pull up roots or consume large amounts.

Remove access and seek veterinary advice after choking, persistent gagging, repeated vomiting, abdominal discomfort, appetite loss, or abnormal stool.

Cat grass does not teach plant safety

A cat cannot reliably learn the botanical rule “this pot is edible, but the similar-looking one is poisonous.”

If cat grass is available, toxic plants still need to be removed or made completely inaccessible. Placement on a high shelf is not reliable protection from a climbing cat or falling leaves.

True lilies and daylilies are particularly dangerous to cats. Pollen, plant material, and vase water can cause fatal kidney injury. See Flowers, Chocolate, and Other Household Dangers for Pets.

Keep every plant label. If the cat chews an unidentified plant, contact a veterinarian immediately and bring photographs or a sample safely contained.

Why cats love cardboard boxes

A box can provide several resources at once:

• concealment;
• a defined boundary;
• shade;
• a place to rest;
• a surface that holds familiar scent;
• an ambush point;
• a lookout when used as a stable platform;
• cardboard edges to rub, bite, or scratch;
• temporary novelty.

Hiding is an important feline coping behaviour. In a randomised study of newly housed shelter cats, cats given cardboard hiding boxes showed a faster reduction in behavioural stress scores than cats without boxes.

A home is not a shelter, and every box does not medically reduce stress. The research supports the broader idea that an accessible hiding choice can help cats manage exposure and feel more control.

Turn a delivery box into safer enrichment

Before the cat gets access:

1. remove the contents;
2. remove staples and metal fasteners;
3. peel off tape and adhesive labels;
4. remove string, straps, ribbon, plastic wrap, and bubble wrap;
5. find silica-gel packets, foam, sachets, and small packing pieces;
6. check for sharp cut edges;
7. smell for chemicals, fragrance, food, oil, or mould;
8. make sure the box is dry and structurally sound;
9. confirm the cat can enter and exit without becoming wedged;
10. collapse and recycle anything unsuitable.

Do not use a box that carried pesticides, cleaners, essential oils, medicines, raw food, leaking products, toxic plants, or an unknown chemical.

Shipping history is not always visible. When odour, staining, powder, dampness, or residue is present, discard the box.

Simple box ideas

A two-door hide

Cut or use two smooth openings so the cat has more than one exit. This can be helpful where another pet might approach.

Make each opening large enough that the cat does not become stuck. Cover or smooth rough cut edges without leaving accessible adhesive.

A peek-and-pounce box

Place a familiar toy through a large hole and move it from outside while keeping fingers away from claws. The holes must be large enough not to trap a paw, claw, collar, or head.

Stop when the cardboard tears into unsafe flaps.

A paper playground

Add several large loosely crumpled sheets of plain packing paper for rustling and searching. Do not use plastic, foil, shredded paper, string, or paper with wet ink or chemical residue.

Scatter a small part of the cat's measured meal for supervised foraging if the cat does not eat paper or cardboard.

A familiar rest box

Add washable familiar bedding. Place the box in a quiet area with an unobstructed exit.

Do not disturb the cat while it is using the box as a retreat.

A cardboard scratch station

Lay a shallow box on its side or place a stable cardboard pad inside. Replace it as edges collapse.

For scratcher selection, read Why Cats Need to Scratch: Cardboard Boards and Healthy Claws.

Box safety needs ongoing checks

Remove a box when it becomes:

• wet or soiled;
• mouldy;
• structurally unstable;
• contaminated with urine, vomit, or faeces;
• covered in loose tape or adhesive;
• shredded into pieces the cat swallows;
• small enough to trap the head or body;
• a source of conflict between animals;
• positioned where it blocks a door or escape route.

Chewing and spitting small cardboard pieces is different from repeatedly swallowing them. Persistent eating of cardboard, paper, fabric, plastic, litter, soil, or other non-food material may be pica and deserves veterinary assessment.

A cat who suddenly hides much more than usual may be frightened, painful, or ill. The box should provide choice, not conceal a health change from the household.

What about wood, sticks, and bark?

Natural textures can be interesting for scratching, rubbing, sniffing, and climbing. Purpose-made cat trees, stable untreated timber scratchers, cork, and bark-like surfaces may offer variety.

But “natural” wood is not automatically safe.

A found branch or scrap may be:

• from a toxic plant;
• chemically treated or pressure-treated;
• painted, varnished, glued, or preserved;
• contaminated by pesticides, animal waste, fungi, or traffic residue;
• rotten or mouldy;
• filled with insects;
• splintered;
• sharp;
• unstable;
• small enough to swallow;
• strong-smelling because of irritating aromatic compounds.

Pallet wood and construction offcuts can have unknown treatment or contamination histories. Driftwood can contain salt, pollutants, sharp fibres, or organisms. Do not assume drying or washing makes them pet-safe.

A safer natural-texture checklist

Prefer a product made and labelled for feline use. If considering a natural wood item, verify:

• the exact tree species;
• that every part is non-toxic to cats;
• no chemical treatment, paint, glue, oil, stain, or preservative;
• complete dryness and absence of mould or rot;
• no sharp points, loose bark, thorns, or splinters;
• a size that cannot be swallowed;
• a broad, secure base or professional wall fixing;
• no gap that can trap a paw, claw, collar, or head;
• intended use for scratching or rubbing rather than chewing.

Ask the veterinarian before offering wood to a cat who chews and swallows non-food material.

Do not apply essential oils or fragrance to make wood interesting.

Some cats react to botanical scents

Catnip and silver vine can cause temporary rolling, rubbing, sniffing, licking, playful movement, or quiet relaxation in cats who respond. Not every cat reacts, and sensitivity differs.

These are separate from cat grass and ordinary wood.

If offering a commercial silver-vine stick or botanical toy:

• choose a reputable feline product;
• supervise initially;
• remove it if pieces break off;
• prevent prolonged chewing or swallowing;
• use small amounts;
• store it between sessions;
• stop if the cat becomes distressed or aggressive.

A response should look voluntary and recover normally after access ends. More stimulation is not always better.

Rotate novelty without removing security

A cat may enjoy a new delivery box because it smells and feels different. Constantly changing every resource, however, can remove familiarity.

Keep core resources stable:

• litter trays;
• food and water locations;
• favourite beds;
• established scratching surfaces;
• safe hiding places;
• climbing routes.

Rotate optional items around that secure foundation:

• one new box;
• a fresh cat-grass tray;
• a different cardboard angle;
• packing paper;
• a familiar toy in a new box;
• a safe scent item.

Introduce one change at a time. That makes the cat's preference easier to read and avoids turning the room into clutter.

Free enrichment is not free of supervision

Low cost does not mean low responsibility.

Inspect homemade and repurposed items for:

• entanglement;
• ingestion;
• choking;
• sharp edges;
• trapped claws;
• collapse;
• blocked ventilation;
• toxic residue;
• conflict in multi-cat homes;
• access by kittens, seniors, or disabled cats who may use the object differently.

Avoid elastic bands, hair ties, thread, yarn, dental floss, ribbon, plastic handles, and loose string. These can be swallowed and cause dangerous intestinal injury.

Never pull visible string from a cat's mouth or anus. Prevent further swallowing and seek urgent veterinary care.

Let the cat show what “fun” means

Enjoyment may look like:

• approaching repeatedly;
• sniffing with a relaxed body;
• sitting in or beside the item;
• nibbling a few grass tips;
• rubbing the cheeks;
• scratching;
• rolling;
• watching from the box;
• playing and then settling;
• sleeping deeply;
• choosing the resource again later.

Discomfort may look like:

• crouching with tense muscles;
• ears held back;
• rapid tail movement;
• repeated retreat;
• hiding without normal recovery;
• frantic chewing;
• drooling;
• gagging;
• vomiting;
• conflict with another cat;
• avoiding the whole area.

Do not measure enrichment by dramatic activity. A box used for a quiet afternoon nap has succeeded.

Build a simple-joy enrichment corner

Choose a calm area and offer:

• one stable open box;
• one box or carrier that provides concealment;
• a cardboard scratcher;
• a familiar washable blanket;
• a safe viewing position;
• an optional supervised cat-grass pot;
• one interactive toy stored away after play.

Keep food, water, and litter appropriately separated rather than crowding every resource into the corner.

In a multi-cat home, duplicate and distribute these choices. One prized box can become a guarded resource.

When a simple preference becomes medical information

Contact a veterinarian when the cat:

• eats large amounts of grass or non-food material;
• vomits repeatedly;
• has diarrhoea or constipation;
• loses appetite or weight;
• drools, gags, coughs, or has difficulty swallowing;
• strains without passing stool;
• becomes lethargic;
• develops abdominal pain or swelling;
• chews wood until the mouth bleeds;
• breaks a tooth;
• suddenly hides much more;
• stops playing or using normal resources;
• may have swallowed string, plastic, foam, tape, wood, or a packing item.

Do not wait for a foreign object to pass when the cat is unwell.

A one-week preference experiment

Offer only safe items and record voluntary use:

1. Day one: a clean open delivery box.
2. Day two: the same box on its side as a hide.
3. Day three: a flat cardboard scratcher nearby.
4. Day four: an inclined cardboard surface.
5. Day five: a supervised pot of correctly identified cat grass.
6. Day six: a purpose-made safe natural-texture scratcher.
7. Day seven: keep the favourites and remove unused clutter.

Record what the cat chose, at what time, and for what behaviour. Do not rank one cat against another.

Preference can change with age, weather, health, household activity, and where the object is placed.

The practical takeaway

A cat does not need an expensive object to experience novelty, choice, and comfort.

Cat grass can be optional sensory enrichment when it is correctly identified, safely grown, fresh, and offered without toxic plants nearby. A clean delivery box can provide hiding, observation, scratching, play, and rest. Natural wood or bark textures may be useful only when the species, treatment, stability, and physical safety are known.

The joy comes from what the cat can do—not what the object cost.

Remove the tape. Check the grass. Avoid mystery wood. Put the box somewhere meaningful, then step back and let the cat decide.