Curly-cup gumweed

Grindelia squarrosa

Also called Gumweed, Rosinweed

We do not have a Blackfoot or Cree name for this one yet. Tell us the name and we will add it, with your word on where it comes from.

Ask firstIn season now

A sticky yellow prairie daisy whose flower buds are wrapped in curled bracts and coated in white gum. Used on skin and for coughs.

Speak with someone who knows this plant before you harvest it.

Take care

  • Gumweed takes up selenium from prairie soils, so it is not something to be taken internally in quantity.
  • Very common on roadsides, which is exactly where not to pick it.

How to know it

Buds
The green base of each flower head is wrapped in bracts that curl sharply back, and the whole thing is covered in sticky white resin. Nothing else on this prairie is gummy like that.
Flowers
Yellow, daisy-like, at the ends of branches.
Leaves
Stiff, toothed, clasping the stem, resin-dotted.
Where
Dry disturbed ground, roadsides, overgrazed pasture. Very common.

The country it grows in

  • Open prairie
  • Roadsides and disturbed ground
  • Coulee slopes
  • Sandy and gravelly ground

Landscape types only. We do not publish where a patch is, and we are not going to.

When it is ready

  • Flowers July to SeptemberThe gummy buds and just-open heads are what is wanted.
  • Leaves July to September

Right now it is July. Something on this plant is in season.

What it is used for

  • Skin and wounds
  • Breathing and colds

A well-documented remedy for poison ivy rash and other skin irritation, applied to the skin.

Also used for coughs and bronchial trouble.

How it is prepared

  • Wash

    Gummy heads steeped in hot water, cooled, and dabbed on irritated skin.

  • Poultice

    Bruised heads laid on a rash.

Protocol

Ask the plant first, and offer something before you take anything. Tobacco is what is most often offered here. Say who you are, and say what the medicine is for.

Harvest the mature plants and leave the small ones to grow. Never take the first plant you find, and never take all of them.

Take only what you will actually use. Medicine picked and then left to rot in a bag was taken for nothing.

Leave the ground as you found it. Put back any dirt you dug up, and return any plant material you do not use to the earth.

Do not gather beside roads, highways or trails, where the plants take up whatever has been sprayed or spilled there.

If you are not certain what a plant is, do not pick it and do not put it in your mouth. Ask someone. Being wrong in the field is how people get hurt.

Where this came from

  • Kershaw, Linda. Edible and Medicinal Plants of the Rockies. Lone Pine Publishing, 2000.
  • Vance, F.R., J.R. Jowsey, J.S. McLean and F.A. Switzer. Wildflowers Across the Prairies. Greystone Books, 1999.
  • Moerman, Daniel E. Native American Ethnobotany. Timber Press, 1998.
Harvest pressure
Common in the right country
How it is approached
Ask first
Last updated
2026-07-24
Back to the finder

Curly-cup gumweed (Grindelia squarrosa) · Birchbark Health medicine finder · birchbarkhealth.org/medicine-finder/gumweed

Written from the published sources listed on this sheet. Last updated 2026-07-24. Corrections are welcome and wanted.

Not medical advice. Never eat, drink or apply a plant you cannot identify with certainty. Poison and Drug Information Service 1-800-332-5678. Emergencies 911.

Something wrong on this sheet? Phone 403-894-2808 or write to us at birchbarkhealth.org/contact