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Plants toxic to guinea pigs (and safe ones to forage)

Foraging fresh weeds and plants is wonderful enrichment, but a few common garden and wild plants are dangerous. Here is what is safe to pick and what to keep well away, 28 plants in all.

Golden rules of foraging: only pick plants you can identify with certainty, never near roadsides or anywhere sprayed with weedkiller, wash everything, and introduce new plants one at a time. If you are not 100% sure what a plant is, do not feed it.
Safe to forageToxic, keep away

Safe plants & weeds to forage

Dandelion

Safe to forage

Leaves, flowers and stems are a nutritious favourite if unsprayed and away from roadsides.

White clover

Safe to forage

Fine in small amounts; too much can be gassy, so introduce slowly.

Plantain (broadleaf weed)

Safe to forage

A common lawn weed that pigs enjoy; not the banana.

Chickweed

Safe to forage

A soft, safe forage plant in moderation.

Grass (hand-picked)

Safe to forage

Great fresh, introduced slowly. Never lawnmower clippings, which ferment.

Rose (petals & leaves)

Safe to forage

Petals and leaves are safe; make sure they are unsprayed.

Raspberry & strawberry leaves

Safe to forage

Safe and often used as a treat; a little astringent.

Mint, basil, parsley, cilantro

Safe to forage

Culinary herbs that are safe in moderation (parsley is high in calcium).

Marigold (calendula)

Safe to forage

Petals are safe and sometimes fed as a treat.

Sunflower (leaves & petals)

Safe to forage

Leaves and petals are fine; seeds are too fatty.

Toxic plants to keep away

Nightshade family

Toxic, keep away

Potato and tomato plants, deadly nightshade and their relatives are poisonous.

Foxglove

Toxic, keep away

Highly toxic; affects the heart. Keep well away.

Buttercup

Toxic, keep away

Irritant and toxic; a very common lawn and meadow weed to avoid.

Daffodil & spring bulbs

Toxic, keep away

Daffodils, tulips, hyacinths and their bulbs are poisonous.

Lily

Toxic, keep away

Many lilies are toxic; keep all of them away from pigs.

Ivy

Toxic, keep away

Common and English ivy are poisonous.

Holly & mistletoe

Toxic, keep away

Berries and leaves are toxic; a winter hazard.

Rhubarb leaves

Toxic, keep away

High in oxalic acid and poisonous, even though we do not feed the stalks either.

Oak leaves & acorns

Toxic, keep away

Tannins make oak toxic to guinea pigs.

Yew

Toxic, keep away

Extremely poisonous; even a small amount can be fatal.

Oleander

Toxic, keep away

One of the most toxic garden plants; never let a pig near it.

Azalea & rhododendron

Toxic, keep away

Toxic to guinea pigs and most pets.

Hemlock

Toxic, keep away

Deadly poisonous; can look like edible weeds, so forage carefully.

Ragwort

Toxic, keep away

Toxic to the liver; a common yellow wildflower.

Bracken fern

Toxic, keep away

Toxic and best avoided when foraging.

Bindweed & morning glory

Toxic, keep away

Toxic climbing weeds.

Houseplants (pothos, philodendron, aloe, dieffenbachia)

Toxic, keep away

Most common houseplants are toxic; keep all of them out of reach.

Avocado plant

Toxic, keep away

The plant, like the fruit, contains persin and is toxic.

For fruit and vegetables rather than garden plants, see our food safety checker.

Last updated August 2026 · Written from years of keeping long-haired guinea pigs in the Houston area. This is general care information, not veterinary advice. For anything medical, please see an exotic vet.