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The Forest Service National Center for Reforestation, Nurseries, and Genetic Resources (RNGR) is a leading source of technical information for nurseries and land managers regarding production and planting of trees and other native plants for reforestation, restoration, and conservation.

 
NPN Protocol Details Image

Calystegia (macrostegia)

Michael Herrera
Nursery Manager
Catalina Island Conservancy
PO Box 2739
Avalon, California 90704
(310) 510-2904
(310) 510-3157 (fax)
mherrera@catalinaconservancy.org
www.catalinaconservancy.org
Family Scientific Name: Convolvulaceae
Family Common Name: Morning Glory Family
Scientific Name: Calystegia macrostegia (Greene) Brummitt
Common Name: Island Morning Glory
Species Code: CALMAC
Ecotype: Catalina Island, California
General Distribution: Island Morning Glory is a Channel islands endemic that is found in rocky places and canyon walls. On Catalina Island, it typically occurs in chaparral or coastal sage shrub communities.
There are 3 subspeccies found on Catalina Island: ssp. cyclostegia, intermedia, and macrostegia.
Propagation Goal: plants
Propagation Method: seed
ProductType: Container (plug)
Stock Type: 1 gallon treepot
Time To Grow: 0
Target Specifications: Height: N/A<br> Caliper: N/A<br> Root System: Firm root plug in container.
Propagule Collection: Seeds are hand collected when seed capsules have fully matured. We have collected capsules in late July.
Propagule Processing: Fruits dry in paper bags in a warm, dry room. We clean the seeds by using a seed blower set at 50 to 60 settings to separate chaff and non-viable seeds.
After seeds have been cleaned, they are stored under refrigeration in air tight glass containers at 40 F and 40% RH.
With 2 collections, seeds weigh an average of 1.29 grams per 90 seeds.
Pre-Planting Treatments: We soak seeds in warm water for 2 hours and/or place them into a 5% bleach solution for 3 minutes. Floaters are removed from sinkers during water soak. We have found that floaters are non-viable.
Growing Area Preparation/
Annual Practices for Perennial Crops:		 The James H. Ackerman Native Plant Nursery is located on Catalina Island off the coast of southern California. From 1993 to 2004, the average maximum and minimum temperatures have been 75.4 F and 46 F, with an average of 361 frost free days per year and annual rainfall of 14 inches.
The facility is comprised of shade houses, mist propagation house, and an outdoor growing compound. All propagation environments are utilized at different stages of seedling growth to provide for the variance in temperature and shading requirements needed during the growing season. We irrigate all containers with an overhead emitter system in the shadehouses and use a drip system or hand water in the outdoor nursery.
Establishment Phase: Seeds are sown in late fall (November) and placed in a shadehouse were they remain for several weeks. Flats or containers are filled with a 1 inch layer of special seed germination mix of 1:1 (v:v) Sunshine Professional Growing Mix and sand on top of 4:1:1 (v:v:v) peat, perlite, and organic compost. We incorporate Osmocote time release fertilizer (9 month release rate) (14 N:14P2O5:14K2O) at the rate of « cup per 0.75 cubic yard of medium. Seeded flats are watered with an overhead emitter system as needed.
Length of Establishment Phase: 3 to 4 months
Active Growth Phase: After seedlings are well established, they are transplanted into #1 treepots (173 cubic inches)filled with a growing medium of 4:1:1 (v:v:v) peat, perlite, and organic compost. Osmocote time release fertilizer (9 mo release rate) (14 N:14P2O5:14K2O) is incorporated into the medium at a rate of
of « cup per .75 cubic yards of medium.
Hardening Phase: Any nursery stock grown under shadehouse conditions are hardened by placing them in full sun exposure for a minimum of 2 weeks prior to outplanting.
Length of Hardening Phase: 2 to 4 months
Harvesting, Storage and Shipping: Containerized seedlings are over wintered directly in the open growing compound.
Length of Storage: Variable; depends on out planting date.

Citation:

Herrera, Mike; Takara, Janet. 2006. Propagation protocol for production of Container (plug) Calystegia macrostegia (Greene) Brummitt plants 1 gallon treepot; Catalina Island Conservancy Avalon, California. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/04/24). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.