Convolvulus tricolor aka Morning Glory

Convolvulus tricolor is known as dwarf morning glory or dwarf convolvulus. It belongs to the morning glory family, Convolvulaceae. Its native range includes Macaronesia and the western and central Mediterranean. The range extends south to Mauritania. It grows in dry, open sites and has spread beyond its native range. Gardeners grow it as an annual in many climates. In warm places, it may live as a short-lived perennial.

This small plant forms a dense bush rather than a climbing vine. Garden plants reach about 1–1.5 feet (0.3–0.46 m) tall and wide. RHS gives an upper size of 1.6 feet (0.5 m) each way. Its branching stems can spill over the sides of pots. The thick stems have hairs, angled edges, and a green-brown hue. They can reach 2 feet (0.61 m) long. Green leaves range from oval to narrow, with wider tips. They lack leaf stalks and may have soft hairs beneath.

The flowers have blue rims, white throats, and yellow centres. Their funnel shape gives them the look of morning glory flowers. Blooms reach about 0.13 feet (0.04 m) across. Each flower lasts one day, but fresh flowers keep opening. The bloom season runs from June to September. Bees, butterflies, and hummingbirds visit the plant. Hairy capsules form after flowering, with fruit present in autumn. The three flower colours account for the name tricolor.

Give this plant full sun and soil that drains well. Afternoon shade helps in places with hot summers. It accepts clay, loam, or sand and a broad pH range. RHS favours gritty soil and a site sheltered from wind. Keep soil moist, though established plants cope with heat and drought. USDA zones 2–11 describe its use as an annual. Winter survival as a short-lived perennial is limited to zones 9–11. RHS rates its UK hardiness H3. Seeds can start indoors before the last frost, or outdoors afterward.

Use dwarf morning glory in borders, rock gardens, pots, or hanging baskets. Its low form also suits gravel gardens and small courtyard beds. Care needs are low, and removing spent blooms extends flowering. Aphids and spider mites may occur, but serious problems are uncommon. RHS also records rare cases of honey fungus. Plants For A Future lists no known edible or medicinal uses. It reports no known hazards, but this does not establish safety for eating.