Caprifoliaceae (Lonicera)

Protocol Information for:

Label_title:
Lonicera (involucrata)

Family Names:

Family Scientific Name:
Caprifoliaceae

Family Common Name:
Honeysuckle Family

Scientific Names:

Genus:
Lonicera

Species:
involucrata

Scientific Classification:
Sub-species

Scientific SubSpecies:
ledebourii

Species Authority:
(Richards)

Scientific SubAuthority:
(Esch.) Zebel

Authors:

Betty Young

Common Synonym:

Genus:
Lonicera

Species:
ledebourii

Synonym Classification:

Synonym SubSpecies:

Species Authority:
Eschsch.

Synonym SubAuthority:

Other Information:

Common Name:
Twinberry Honeysuckle

Species Code:
LONINV

Ecotype:
Marin County, California

General Distribution:
L. involucrata var.ledebourii is the coastal variety that is found from Central California north to British Columbia in wooded habitats.

Known Invasiveness:

Propagation Goal:
plants

Propagation Method:
seed

Product Type:
Container (plug)

Stock Type:
Deepot 40

Grow Time:
0

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

Propagation Collection:
Seeds are collected between April 1st and July 1st.
Mature fruits are bluish black.
Seed is hard at maturity.

Propagation Processing/Propagule Characteristics:
Seed Cleaning:Mash berries in a bucket, wash until seeds are free and pour through a sieve. Repeat and dry seeds.
Storage Conditions: Seeds are kept dry and stored in a refrigerator.

Pre-Planting Propagule Treatments:
Soak seeds in fresh water for 12 hours. Cold stratify in peat or perlite for 3 to 6 months.

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 June 15th.
% Germination:50%

Establishment Phase:
Seeds germinate 14 days after sowing.
Seedlings are transplanted 14 days after germination to individual containers 2"x8" tubes (Deepot 40) containing standard potting mix of peat moss, fir bark, perlite, and sand.
Transplant Survival averages 90%.

Length of Establishment Phase:
28 days

Active Growth Phase:
Fertilize with Nutricote NPK (13-13-13) 3 months after transplFertilize with Nutricote NPK (13-13-13) 1 month after transplanting.
Cut back 2 months after transplanting, leaving at least 4 nodes. Repeat as needed.
Twinberry is a rapid growing species.

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) Lonicera involucrata (Richards) plants Deepot 40; San Francisco, California. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/06/30). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.

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