How to Care for Morning Glory

Morning Glory (Ipomoea purpurea) is a vigorous twining annual vine that unfurls silky, funnel-shaped flowers in blue, purple, pink, magenta, and white each morning, fading by afternoon and replaced by fresh blooms daily through the warm season. Fast, forgiving, and generous, it quickly clothes a trellis, arch, or fence in heart-shaped foliage and color.

Light

Morning Glory demands full sun to bloom well: give it at least six to eight hours of direct light. In too much shade it produces plenty of lush leaves but few flowers, so a bright, open, sunny position is essential for a good display.

Water

Provide moderate, regular water, especially during dry spells and while the vine is climbing hard. Keep the soil from drying out completely during flowering, but avoid constant sogginess. Established plants have some drought tolerance, though flowering suffers if they wilt frequently.

Soil & Potting

Morning Glory grows in average, well-drained soil and actually blooms best when the ground is not too rich. Overly fertile soil drives leafy growth at the expense of flowers. A moderately fertile, free-draining loam is ideal; in containers use a standard potting mix with a tall support in place from the start.

Humidity & Temperature

A warm-season plant, Morning Glory loves heat and is frost-tender, so it is grown as an annual in most climates. Sow or plant out only after the last frost when the soil has warmed. It tolerates humidity well and thrives through hot summers, blooming until cut down by autumn cold.

Feeding

Feed sparingly. Too much nitrogen yields a wall of leaves and few blooms. If the soil is very poor, a light dose of a balanced or bloom-oriented (higher phosphorus) fertilizer supports flowering. In average soil, no feeding is usually needed at all.

Propagation

Morning Glory is easily grown from seed sown after the last frost. Nicking each hard seed coat with a file and soaking the seeds overnight speeds and improves germination. Sow directly where they are to grow, as the vines resent root disturbance; they also self-sow readily from year to year.

Repotting / Pruning

Provide a trellis, netting, strings, or an arch at planting time so the twining stems have something to grip. Pinch young seedlings once to encourage branching. Trim wayward or overgrown stems anytime to keep the vine in bounds. Remove faded flowers and developing seed pods to prolong bloom and limit self-seeding.

Common Problems & Pests

Generally easy and robust, Morning Glory can attract aphids and spider mites in hot, dry conditions; rinse them off with water or treat as needed. Leaf spot and rust may appear in damp, crowded plantings, so ensure airflow. The most common complaint is all leaves and no flowers, caused by too much shade or too-rich, over-fertilized soil.

Seasonal Care Tips

In spring, wait for warm soil, then scarify and sow seeds directly at the base of a support. Through summer, water during dry spells, guide the vines onto their trellis, and deadhead to keep blooms coming. In fall, the vine is killed by frost; pull the spent plant and collect or let seeds self-sow for next year.