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Although big leaf hydrangeas need sun to bloom well, give them afternoon shade in hot regions. Also, most varieties bloom on old wood, so prune just after the flowers have faded.
The flowers on a hydrangea shrub can change from blue to pink or from pink to blue from one season to the next depending on the acidity level of the soil. [32] Adding organic materials such as coffee grounds and citrus peel will increase acidity and turn hydrangea flowers blue. [ 33 ]
Hydrangeas are brimming with nostalgia, stirring memories of endless Southern summers. When winter arrives, these charming plants need a little TLC to ensure summer blooms return the following season.
Blue flowers will thrive in soil that has a pH of less than 5.5, and a pH higher than 6 will result in pink blooms. Your plant should be at least 2 years old before undergoing a pH change.
The flowers are a pale green as they emerge and open to a bright white, ageing to either pink or brown (depending on the cultivar/seedling). [4] Hydrangea quercifolia and Hydrangea paniculata are the only hydrangeas with cone-shaped flower clusters (i.e. panicles); all the others have their flowers in ball-shaped or flat-topped clusters, called ...
Hydrangea serrata is similar to H. macrophylla except it is a smaller more compact shrub with smaller flowers and leaves; it is also more hardy. With a rounded habit, it features dark green, serrated (toothed), ovate leaves to 15 cm (6 in) long, and clusters of long-blooming blue or pink lacy flowerheads in mid- to late summer.
Many can handle full sun, which is considered 6 or more hours of direct sunlight. However in the south, hydrangeas do best with morning sun and afternoon shade, says LeCompte.
Showy, sterile flowers are usually absent or if present they are usually less than 1 cm in diameter on the edge of the panicles. [4] Flowering occurs May to July. Fruit is a ribbed, brown capsule about 2 mm long. Many are produced in October and persist through the winter. [3]