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Calystegia macrostegia
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Island Morning Glory
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Calystegia macrostegia

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About Island Morning Glory (Calystegia macrostegia) Calystegia macrostegia is a species in the Convolvulaceae (Morning Glory) family known by the common name Island Morning Glory. It is found on the Channel Islands and also on the mainland coast from Monterey County southward into Baja, Mexico. It is a woody perennial vine which may be a low and herbaceous or a stout, climbing plant which can approach 9 meters in length. The triangular leaves may be over 10 centimeters wide. It blooms over a long period, producing white to very pale pink blooms with corollas 2 to over 6 centimeters wide.

There are six recognized subspecies with overlapping ranges. There is also a commonly available horticultural variety known as 'Anacapa Pink'. It works best with a fence, trellis or something it can climb on, but can also be used as a ground cover. It grows so vigorously that it may need to be cut back annually. Plant in full sun along the coast. Inland give afternoon shade and additional water.
Plant Description
Plant Type
Vine, Perennial herb

Max. Height
1 ft (0.3 m)

Max. Width
20 - 30 ft (6.1 - 9.1 m)


Growth Rate

Summer Semi-Deciduous

Flower Color
Pink, White

Flowering Season
Spring, Summer, Winter

Native Status

Natural Setting
Site Type
Dry, rocky places typically near the coast but sometimes in interior mountains and canyons


Elevation ?
-2547' - 6450'

Annual Precip. ?
3.7" - 52.0"

Summer Precip. ?
0.14" - 1.89"

Coldest Month ?
34.9° F - 57.6° F

Hottest Month ?
58.2° F - 86.2° F

Humidity ?
0.60 vpd - 37.19 vpd

Soil Description
Typically sandy and/or rocky soil

Soil PH
6.0 - 8.0

Fast, Medium

Cold Tolerance(° F)
Tolerates cold to 10° F

Companion Plants
Landscaping Information
Ease of Care
Very Easy

Water Requirement ?
Extremely Low, Very Low
Extremely Low
Very Low
Moderate - High

Moderately Popular

Max. Summer Water ?
2x/month, 3x/month
No Summer Water
Keep moist

Prune in winter to control spread and encourage new growth and flowering

Common uses
Groundcovers, Bee Gardens

Nursery Availability
Commonly Available

Other Names
Common Names
Island False Bindweed

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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