Curly-cup Gumweed
Grindelia squarrosa

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Grindelia (grin-DEL-lee-uh) (Info)
Species: squarrosa (skwa-RO-suh) (Info)
Synonym:Grindelia squarrosa var. squarrosa

Category:

Perennials

Height:

6-12 in. (15-30 cm)

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

Spacing:

18-24 in. (45-60 cm)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

Sun Exposure:

Full Sun

Danger:

N/A

Bloom Color:

Bright Yellow

Bloom Time:

Mid Summer

Foliage:

Herbaceous

Other details:

Drought-tolerant; suitable for xeriscaping

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Non-patented

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; direct sow after last frost

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Regional

This plant has been said to grow in the following regions:

Minneapolis, Minnesota

Fargo, North Dakota (2 reports)

Gardeners' Notes:

0
positives
1
neutral
0
negatives
RatingContent
Neutral

On Feb 18, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

This very common plant is found in Minnesota - often dismissed as another yellow daisy. It blooms during the height of summer, July to August so is a very tough plant. Rarely encountered in gardens, it is very common in roadside and is id by its swollen stem just under the flowers. That make a big difference from other common yellow daisies in the area. Also will grow in crevices in concrete that have very little soil. May be more common eastern than reported.