When does Calystegia macrostegia bloom?

Calystegia macrostegia typically blooms from April through July, producing large funnel shaped flowers along its trailing or climbing stems.

What pollinators are attracted to Calystegia macrostegia?

Bees, butterflies, and hummingbirds regularly visit the flowers of Calystegia macrostegia for nectar and pollen.

How much water does Calystegia macrostegia need once established?

It is a low water plant once its roots are established, making it a good fit for dry slopes and coastal scrub style plantings.

What light conditions work best for Calystegia macrostegia?

This vine grows well in part sun and can also handle full sun in cooler coastal areas, though it appreciates some afternoon shade inland.

Is Coast Morning Glory HOA-friendly?

Coast Morning Glory takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Coast Morning Glory

Name: Pollinator Patch
Author: Pollinator Patch

Calystegia macrostegia

Last reviewed: August 2026

Calystegia macrostegia is a twining vine with funnel shaped white to pale pink flowers that bloom from April through July. It suits dry, part sun gardens and slopes in coastal Southern California landscapes.

Coast Morning Glory (Calystegia macrostegia) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

part sun

Water

low

Size

36"–240" H × 36"–240" W

Bloom

Apr, May, Jun, Jul

Native to

Pollinators

bees, butterflies, hummingbirds

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Browse plants for this ecoregion

Central California Foothills and Coastal Mountains Southern California Mountains Southern California/Northern Baja Coast

Calystegia macrostegia (Island Morning Glory) is a climbing or sprawling perennial vine native to coastal regions. It features heart-shaped leaves and large, showy white to pale pink funnel-shaped flowers that bloom from spring through summer. This drought-tolerant vine can spread extensively when given space.

Growing Coast Morning Glory

Grow Coast Morning Glory in part sun and low water. Mature plants reach 36 to 240 inches tall and spread 36 to 240 inches wide. Expect high maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Coast Morning Glory takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Extremely vigorous growth can appear unkempt
Can climb and overwhelm nearby structures and plants
Often considered too wild-looking for formal landscapes

Wildlife value

Host plant for white-lined sphinx moth.

Excellent pollinator plant that attracts bees, butterflies, and hummingbirds. The trumpet-shaped blooms provide nectar throughout the growing season.

Common questions

When does Calystegia macrostegia bloom?: Calystegia macrostegia typically blooms from April through July, producing large funnel shaped flowers along its trailing or climbing stems.
What pollinators are attracted to Calystegia macrostegia?: Bees, butterflies, and hummingbirds regularly visit the flowers of Calystegia macrostegia for nectar and pollen.
How much water does Calystegia macrostegia need once established?: It is a low water plant once its roots are established, making it a good fit for dry slopes and coastal scrub style plantings.
What light conditions work best for Calystegia macrostegia?: This vine grows well in part sun and can also handle full sun in cooler coastal areas, though it appreciates some afternoon shade inland.
Is Coast Morning Glory toxic to dogs?: Coast Morning Glory is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
Is Coast Morning Glory toxic to cats?: Coast Morning Glory is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
Is Coast Morning Glory HOA-friendly?: Coast Morning Glory takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

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