World's Best Cat Litter vs Sustainably Yours: Plant-Based Clumping Litters Compared on Clump Strength, Tracking and Cost per Month

The question comes up constantly at the litter shelf: "I want to get off clay, but will a plant litter actually clump hard enough to scoop?" Owners switching from heavy bentonite are usually weighing two of the most-requested biodegradable options we stock — whole-kernel corn from World's Best Cat Litter, and the corn-plus-cassava blend from Sustainably Yours. Both are in our cat litter collection, and both clump. They just fail and succeed in different places.

Short verdict: World's Best Cat Litter gives the tighter, faster-setting urine clump and the easier septic/flush conversation, while Sustainably Yours tracks noticeably less thanks to its mixed-granule build and stretches further per bag in multi-cat boxes. If you scoop twice a day and hate sticky box bottoms, lean corn. If you're tired of sweeping granules down a condo hallway, lean the cassava blend. Browse both alongside the rest of our cat supplies before you commit to a 26 lb bag.

World's Best Cat Litter: whole-kernel corn and the hardest plant clump on the shelf

World's Best Cat Litter is made from whole-kernel corn, and the starch in that kernel is what does the clumping — there's no added bentonite, sodium silicate or synthetic binder in the standard formulas. In practice, a urine deposit of roughly 60–80 g forms a dense, liftable ball within about 10–15 minutes, and it releases from the box floor instead of cementing to it.

That matters more than most people expect. A clump that shatters on the scoop leaves fines behind, those fines absorb the next urination, and within five days the box smells even though you've been scooping daily. Corn litter's starch clump holds its shape, which means you're removing nearly all the saturated material every time. Customers often ask us why their box "smells clean for a week now" after switching — it's usually clump integrity, not fragrance.

Depth is the variable people get wrong. Fill to about 3 inches (7.5 cm). Shallower than that and even a strong corn clump will reach the plastic and stick. On a standard 16 x 12 inch open pan, that's roughly 8–9 lbs of litter for the initial fill, so a 28 lb bag gives you one full fill plus several weeks of top-ups. A single adult cat using a scoop-and-replenish routine typically consumes somewhere around 8–10 lbs per month, which is how we'd frame monthly cost: bags per month rather than dollars.

Two honest drawbacks. First, tracking — the granules are uniform and light, so they ride out on paws and land a metre or two from the box. A deep-sided box or a mat with a coarse weave solves most of it. Second, corn is a food-grade grain, and the FDA Center for Veterinary Medicine monitors aflatoxin in corn-based products generally; store any corn litter dry, off a damp basement floor, and don't keep an opened bag through a humid Toronto August.

Who it suits: owners with one or two cats who scoop daily, anyone on a septic system, and households where a firm, no-residue clump matters more than a tidy floor.

Sustainably Yours: a corn-and-cassava blend built around low tracking

Sustainably Yours blends corn with cassava — the same tapioca-yielding root used in food thickeners — and deliberately mills the granules in two different sizes. That mixed grind is the whole point: smaller particles settle into the gaps between larger ones, so the bed packs down instead of skittering, and far less material clings to paw fur on exit.

If tracking is your actual complaint, this is the more direct fix of the two. In our store we see this come up most from condo and townhouse owners whose litter box shares a floor with hardwood or low-pile carpet; the dual-granule structure is what they're really buying. Dust is also very low, which matters in a 600 sq ft space where the box lives in a bathroom with the door mostly closed.

Clump strength is good but not quite corn-level firm at the edges. The fix is depth again — go a full 3 inches, and give clumps 10–15 minutes to set before scooping rather than digging immediately after your cat exits. Scooped that way, clumps come out intact. Dug out early, the softer rim crumbles and you lose material.

Bag economics favour this one in multi-cat homes. The 40 lb bag is the largest plant-based option we carry, and because the granules are dense and pack efficiently, a two-cat household running two boxes at 3 inches each will generally get through a month on roughly 18–22 lbs of top-up litter after the initial fill. Both this and the corn option are also eligible under our price match guarantee, which takes the sting out of testing a large bag.

Who it suits: multi-cat households, apartment and condo owners, anyone with dust sensitivity in the home, and owners who want a compostable-in-principle litter without babysitting the scoop schedule.

What our staff recommends

Our team recommends starting with the 13–14 lb bag of whichever litter you choose, not the big one — cats reject texture changes more often than owners expect, and a 40 lb bag your cat refuses is an expensive lesson. Transition by mixing 25% new litter into the old for three to four days, then 50%, then 75%, over roughly a week and a half.

When someone comes in frustrated that "no litter controls the smell," we usually start with box math rather than product. The ASPCA and most feline behaviour guidance recommend one box per cat plus one spare — three boxes for two cats — and a full dump-and-wash every three to four weeks with unscented soap. Plant litters reward that routine; they don't paper over a box that's two weeks past due.

Diet is the second lever, and it's the one people skip. Cats on wet cat food at 75–78% moisture produce larger, wetter urine clumps than kibble-fed cats — good for urinary health, harder on soft-edged litter, so those homes especially need the full 3-inch bed. Stool firmness tracks with the fiber content listed on the guaranteed analysis; a sudden shift to loose stool after a food change makes any clumping litter look like it failed when the real issue is the bowl. Any complete diet should meet AAFCO nutrient profiles for the cat's life stage — AAFCO's 2026 Official Publication remains the reference most Canadian labels build from — and a formula with adequate taurine and moderate protein content supports normal urinary volume. Persistent straining, blood, or out-of-box urination is a veterinary matter, not a litter matter; see your vet, and read the Canadian Veterinary Medical Association guidance on when urinary signs are urgent.

On flushing: both litters are plant-based, but the American Veterinary Medical Association and public-health sources note that Toxoplasma gondii oocysts shed in cat feces can survive in soil and water for well over a year, and Toronto's wastewater guidance discourages flushing litter of any kind. Flush urine clumps sparingly if your plumbing is older than your cat, and keep solids out of the toilet entirely if anyone in the home is pregnant or immunocompromised.

Our store at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 is open 7 AM to 11 PM daily, with local delivery available via DoorDash and other apps. Staff can carry a 40 lb bag to your car if you ask — most people don't.

Common questions about plant-based clumping litters

Which clumps harder, corn litter or cassava litter?

Corn clumps harder. Whole-kernel corn litter forms a firm, liftable clump in about 10–15 minutes that releases cleanly from the box floor, while a corn-cassava blend sets slightly softer at the clump edge. Both hold together well at a 3-inch (7.5 cm) bed depth; the blend is the one that suffers most in a shallow box.

Practically, if you scoop once every two days instead of daily, the firmer corn clump is more forgiving. If you scoop every morning, the difference largely disappears.

Is plant-based cat litter actually low tracking?

Sustainably Yours is genuinely low-tracking because its granules come in two sizes that pack together instead of scattering. Uniform-granule corn litter tracks moderately — lighter than clay dust, but it travels on paws. A high-sided box plus a coarse-weave mat cuts visible tracking substantially for either litter.

Long-haired cats track more regardless of litter. Trimming the fur between the toe pads helps, and so does a quick paw check during normal grooming — our cat grooming supplies cover the basics.

How much litter will I actually use per month?

Plan on roughly 8–10 lbs per month for one cat with daily scooping and a full change every three to four weeks, or about 18–22 lbs per month for two cats across two boxes. A 28 lb corn bag or a 26 lb blend bag covers a single cat for close to three weeks of scooping after the initial 8–9 lb fill.

Buying the largest bag your storage allows is the single biggest lever on monthly spend, which is why the 40 lb format exists.

Can I compost or flush these litters in the GTA?

Both are plant-derived and biodegradable, but Toronto's green bin program does not accept cat litter, and municipal wastewater guidance discourages flushing. Treat flushability as a plumbing-friendly bonus for small amounts of urine clump, not a disposal plan — bag solids and put them in the garbage.

Never compost cat feces for use on a vegetable garden. Parasite survival in soil is the reason, as documented in literature indexed by the National Center for Biotechnology Information.

At a glance: World's Best Cat Litter wins on clump firmness and septic-friendliness; Sustainably Yours wins on tracking, dust and bag economics in multi-cat homes. Both need a 3-inch bed, daily scooping and one box per cat plus one to perform as advertised. Start with a mid-size bag and transition over 7–10 days.