Does cayenne pepper keep squirrels out of your pots?
Why people try it
Cayenne gets its heat from capsaicin, and squirrels really do dislike it. In a 1995 study, free-ranging grey squirrels avoided sunflower hearts treated with capsaicin at every strength tested. That shows it can deter squirrels from eating treated seed; it doesn’t tell us how well a sprinkle on potting soil works.
The problems
- It hurts. Capsaicin works by irritating the eyes and nose. Loose powder can get into a digging squirrel’s eyes and nose and cause a painful burning sensation, and Ontario’s Master Gardeners advise against it for that reason.
- It hits more than squirrels. It’s toxic to bees and other useful insects, and a cat or dog that digs or walks in it can also be irritated by the powder.
- It washes away. Rain and watering can wash the powder away, so any effect may be short-lived.
- Homemade mixes aren’t tested. Health Canada notes that homemade pesticides go through no scientific evaluation and come with no label for safe use.
What works instead
Squirrels dig because loose soil is easy and something tasty might be under it. Take that away. Lay wire mesh over the soil, or a layer of stones too heavy to flick. Over freshly planted bulbs, an upside-down clay saucer or strawberry basket works until spring. Plant bulbs deeper, and choose ones squirrels leave alone, like daffodils and alliums.
More options, from mesh to bulbs, are in our guide to keeping squirrels off your balcony plants.
If you want a repellent
Buy one made for the job. Products registered in Canada carry a PCP number on the label, along with directions and first aid. Capsaicin repellents sold for animals are made to stick to the surface instead of puffing into eyes. Read the label: some aren’t for herbs or vegetables, and all need reapplying.
Feeding birds near your pots?
Spilled seed draws squirrels to the planters below. Birds can’t taste capsaicin, so seed treated with it keeps squirrels off the feeder without bothering the birds. On a balcony, though, the simplest fix is no feeder: seed also brings pigeons.
What to buy
| Item | What it’s for | What to look for |
|---|---|---|
| Hardware cloth | Over pot soil, with holes snipped for stems | Galvanized metal, about 1 cm openings, cut with tin snips |
| Clay saucers | Upside down over newly planted bulbs | A size wider than the planting hole; lift them in spring |
| Registered animal repellent | When mesh isn’t practical | A PCP number on the label; check whether it’s allowed on edible plants |
| Capsaicin-treated birdseed | Only if you keep a feeder | Sold as “hot” or squirrel-proof seed; keep it away from your eyes |
Sources
- Master Gardeners of Ontario: why we don’t recommend cayenne pepper explains the harm to animals’ eyes and noses, bees and pets, and suggests barriers, saucers over bulbs and registered repellents instead.
- Fitzgerald et al. (1995): capsaicin as a repellent to birdseed consumption by grey squirrels found squirrels avoided capsaicin-treated seed at every concentration tested.
- Health Canada: pesticides FAQ notes that homemade pesticides aren’t scientifically evaluated and that registered products carry a PCP number.
Rules differ by province and city. Check product labels before using any pesticide.