Coast Morning Glory
Calystegia macrostegia
Last reviewed: June 2026
Calystegia macrostegia is a native California vine that produces white trumpet-shaped flowers from April through July. This drought-tolerant morning glory attracts bees, butterflies, and hummingbirds to coastal and inland gardens.
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
CA
Pollinators
bees, butterflies, hummingbirds
Browse plants for this ecoregion
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?
- Coast Morning Glory blooms from April through July, producing white trumpet-shaped flowers throughout the spring and early summer months.
- What pollinators visit Calystegia macrostegia?
- This native vine attracts bees, butterflies, and hummingbirds with its large white flowers and nectar.
- Where is Calystegia macrostegia native?
- Coast Morning Glory is native to California, where it grows naturally in coastal sage scrub, chaparral, and oak woodland habitats.
- How much water does Calystegia macrostegia need?
- This drought-tolerant native requires low water once established, making it well-suited to California's dry summer climate and water-wise gardens.
- 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.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Coast Morning Glory? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz