Asteraceae (Heterotheca)

Protocol Information for:

Label_title:
Heterotheca (sessiliflora)

Family Names:

Family Scientific Name:
Asteraceae

Family Common Name:
Sunflower Family

Scientific Names:

Genus:
Heterotheca

Species:
sessiliflora

Scientific Classification:
Sub-species

Scientific SubSpecies:
bolanderi

Species Authority:
(Gray) Semple

Scientific SubAuthority:
(Gray) Semple

Authors:

Betty Young

Common Synonym:

Genus:
Chrysopsis

Species:
villosa

Synonym Classification:
Variety

Synonym SubSpecies:
bolanderi

Species Authority:
(Gray) Gray ex Jepson

Synonym SubAuthority:

Other Information:

Common Name:
Sessileflower False Goldenaster

Species Code:
HETSESS

Ecotype:
Tennessee Valley, California

General Distribution:
H. sessiliflora ssp. bolanderi is found on grassy slopes near the coast, below 1500 feet elevation; from Mendincino County to San Francisco Bay, California.

Known Invasiveness:

Propagation Goal:
plants

Propagation Method:
seed

Product Type:
Container (plug)

Stock Type:

Grow Time:
0

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

Propagation Collection:
Seeds are collected between September 1st and November 15th.
Mature inflorescences are brown.

Propagation Processing/Propagule Characteristics:
Seed Cleaning:None required.
Storage Conditions: Seeds are kept dry and stored in a refrigerator.

Pre-Planting Propagule Treatments:
None required.

Growing Area Preparation / Annual Practices for Perennial Crops:
Fully Controlled Greenhouse.
Sowing Method: Transplanting Germinants.
Seeds are sown in flats containing Sunshine Mix #4 Aggregate Plus (peat moss, perlite, major and minor nutrients, gypsum, and dolomitic lime).
Seeds covered with media.
Flats are watered in with an automatic mist and irrigation system.
Seeds are sown on May 1st.
% Germination:50%

Establishment Phase:
Seeds germinate 21 days after sowing.
Seedlings are transplanted 21 days after germination to individual containers containing standard potting mix of peat moss, fir bark, perlite, and sand.
Transplant Survival averages 60%.

Length of Establishment Phase:

Active Growth Phase:

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) Heterotheca sessiliflora (Gray) Semple plants San Francisco, California. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/06/04). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.

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