How much sun does Hill morning glory need?

Hill morning glory grows best in full sun conditions.

When does Hill morning glory bloom?

Hill morning glory blooms in March, April, and May.

Where is Hill morning glory native?

Hill morning glory (Calystegia subacaulis) is native to CA, per the World Checklist of Vascular Plants (Kew).

Hill morning glory

Name: Pollinator Patch
Author: Pollinator Patch

Calystegia subacaulis

Last reviewed: November 2026

Hill morning glory (Calystegia subacaulis) is a perennial vine native to CA. It blooms in March, April, and May. The flowers draw bees.

Watering reminders and freeze alerts for Hill morning glory, free in the app.

Toxicity unknown

Hill morning glory (Calystegia subacaulis) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

full sun

Water

low

Size

4"–10" H × 12"–24" W

Bloom

Mar, Apr, May

Native to

Pollinators

bees

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Browse plants for this ecoregion

Coast Range Central California Foothills and Coastal Mountains

A low, mostly stemless morning glory relative with arrow-shaped leaves close to the ground and large funnel-shaped white to pale lavender flowers in spring. Its sprawling habit reads as informal rather than tidy.

Growing Hill morning glory

Grow Hill morning glory in full sun and low water. Mature plants reach 4 to 10 inches tall and spread 12 to 24 inches wide.

Wildlife value

The large spring flowers are an important early nectar source for native bees in open grassland.

Common questions

How much sun does Hill morning glory need?: Hill morning glory grows best in full sun conditions.
When does Hill morning glory bloom?: Hill morning glory blooms in March, April, and May.
Where is Hill morning glory native?: Hill morning glory (Calystegia subacaulis) is native to CA, per the World Checklist of Vascular Plants (Kew).
What pollinators does Hill morning glory attract?: Hill morning glory draws bees.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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Ready to grow Hill morning glory? Add it to your garden in the Pollinator Patch App to track it and get season-by-season care guidance.

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