Management Methods and Propagation Techniques for Hydrangea

Hydrangea, also known as florist's hydrangea, blooms from June to July. The flowers open white and gradually turn pink or blue, forming large spheres composed of sterile flowers. When the flowers are in full bloom, they look like snow weighing down the branches, charming and lovely. Its branches and leaves spread densely, and its roots are fleshy. It has strong adaptability and can be planted in home courtyards or in a corner of a patio, and is also suitable for pot cultivation to add color to balconies and windows.

Hydrangea prefers semi-shade and a humid environment, and is not very cold-tolerant. In the intense heat of summer, it should avoid direct sunlight, otherwise the leaves easily scorch, wither, and turn yellow. It is not suited to excessive dryness, and grows best in light loam rich in humus, moist, and well-drained. Branches and leaves tend to wilt and wither after frost. When cultivated in the open ground, the aboveground parts die in winter, and the following year new shoots sprout from the rhizome and bloom again. If potted and overwintered in a greenhouse, it can remain evergreen.

The key maintenance and management points for the four seasons are as follows:

Spring: For potted plants, prune dead branches and repot with fresh soil. After the plant has adjusted, apply a thin liquid fertilizer mainly based on nitrogen fertilizer once or twice to promote the sprouting of branches and leaves.

Summer and autumn: Place in a semi-shaded spot or under a shade frame to prevent direct sunlight and avoid leaves turning yellow and scorching. Apply topdressing once or twice before and after flowering to promote green leaves and abundant blooms. After the flowers fade, promptly remove the flower stems to maintain a neat appearance. Keep the potting soil consistently moist, but prevent water accumulation after rain to avoid the fleshy roots of hydrangea rotting from excessive moisture.

Winter: After winter begins, plants grown in the open ground should be earthed up around the base to keep warm so they can overwinter safely; potted plants can be placed in a warm spot facing south and sheltered from cold winds. Although the leaves fall off in winter, the roots and branches remain alive, and new leaves sprout again the following spring.

Hydrangea can be propagated by cuttings or layering. Cuttings are often taken during the plum rain season, using robust young shoots of the current year, 10 cm to 15 cm long, with the first cutting having two or three nodes; the survival rate is very high. For layering, the mound layering method can be used. When the plant begins to grow in spring, use old branches for layering, and roots will form in about 30 days. Cut them off in June to July of that year, and divide and replant them in February to March of the following year; they can bloom that same year.