Asteraceae (Grindelia)

Protocol Information for:

Label_title:
Grindelia (hirsutula)

Family Names:

Family Scientific Name:
Asteraceae

Family Common Name:
Sunflower Family

Scientific Names:

Genus:
Grindelia

Species:
hirsutula

Scientific Classification:

Scientific SubSpecies:

Species Authority:
Hook. & Arn.

Scientific SubAuthority:

Authors:

Betty Young

Common Synonym:

Genus:

Species:

Synonym Classification:

Synonym SubSpecies:

Species Authority:

Synonym SubAuthority:

Other Information:

Common Name:
Hairy Gumweed

Species Code:
GRIHIR

Ecotype:
MArin County, California

General Distribution:
G. hirsutula is found on arid slopes from coastal sage scrub; from Napa County to Monterery County; also Ventura County, California.

Known Invasiveness:

Propagation Goal:
plants

Propagation Method:
seed

Product Type:
Container (plug)

Stock Type:
Deepot 16

Grow Time:
0

Target Specifications:
Height: N/A
Caliper: N/A
Root System: Firm plug in container.

Propagation Collection:
Seeds are collected between June 1st and October 1st.
Mature inflorescences are brown.

Propagation Processing/Propagule Characteristics:
Seed Cleaning: Rub seed heads over seed.
Storage Conditions: Seeds are kept dry and stored in a refrigerator.

Pre-Planting Propagule Treatments:
Soak fresh seeds overnight in water. Cold stratify in peat moss for 2 weeks or until seeds begin to sprout.

Growing Area Preparation / Annual Practices for Perennial Crops:
Fully Controlled Greenhouse.
Sowing Method: Transplanting Germinants.
6 grams of seeds are sown per flat containing Sunshine Mix #4 Aggregate Plus (peat moss, perlite, major and minor nutrients, gypsum, and dolomitic lime).
Seeds are covered with media.
Flats are watered in with an automatic mist and irrigation system.
Seeds are sown on August 15th.
% Germination:50%

Establishment Phase:
Seeds germinate 14 days after sowing.
Seedlings are transplanted 14 days after germination to individual containers 2"x7" tubes (Deepot 16) containing standard potting mix of peat moss, fir bark, perlite, and sand.
Transplant Survival averages 75%.

Length of Establishment Phase:

Active Growth Phase:
Fertilize with Nutricote NPK (13-13-13) 3 months after transplanting.
Prune back 2 months after transplanting; leaving at least 4 nodes.

Length of Active Growth Phase:

Hardening Phase:

Length of Hardening Phase:

Harvesting, Storage and Shipping:

Length of Storage:

Guidelines for Outplanting / Performance on Typical Sites:

Other Comments:

References:
A California Flora and Supplement, Munz, P., University of California Press, Berkeley and London, 1973.

Citation:
Young, Betty. 2001. Propagation protocol for production of Container (plug) Grindelia hirsutula Hook. & Arn. plants Deepot 16; San Francisco, California. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/07/17). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.

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