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Hydrangea (Hydrangea common name) is a genus that includes about 100 species of flowering plants native to South and East Asia (from Japan to China, the Himalayas and Indonesia) and also in North and South America. Are usually known by its common name of hydrangeas.

Hydrangea Most are shrubs 1-3 m tall, but some are small trees, and some are vines that reach 30 m by climbing trees. They can be deciduous or evergreen, though the most widely grown, which are temperate species are deciduous.

The Hydrangeas produce flowers from early spring to late autumn, and these are grouped in bunches, at the end of the stems. Each individual flower hydrangea is relatively small, but the color display is enhanced by a circle of modified bracts around each flower.

Its flowers can be pink, white, or blue, depending in part on soil pH. In relatively acidic soils (pH between 4.5 and 5) the flowers are blue in alkaline soils (pH between 6 and 6.5) acquire the pink flowers, and in alkaline soils (pH about 8) the white flowers grow.

You can force the pinkness of the flowers, using fertilizer rich in nitrogen and phosphorus and low in potassium, whereas if you want blue flowers, fertilizers have to be rich in potassium and low in nitrogen and phosphorus. The blue flowering may also require the provision of acidifying fertilizers such as ammonium sulfate, ammonium nitrate, potassium sulfate, etc.. You can also add aluminum sulfate if the above measures are insufficient.

The pink color is achieved with alkaline fertilizers, such as calcium nitrate.
Careful addition of sodium carbonate to the ground can produce a multicolor flowering.
Hydrangeas are among the few plants that accumulate aluminum. Obtain aluminum from acid soils, and forms complexes in the flower that gives them their blue color.

The hydrangea is grown since ancient times as an ornamental plant in Japan, and from mid-nineteenth century also extensively in other areas of the world with temperate climates. It is a very popular ornamental plant for its large flower heads, with the species H. macrophylla being by far the most widely cultivated about 600 cultivars known. Regular pruning keeps the shrub grows up too, which usually causes the stem weight becomes excessive, can the ends of the stems bend toward the ground and break.

Irrigation: During spring-summer of hydrangeas risks have to be abundant and frequent, so that the substrate always be moist (not wet). Often also recommend spraying the hair (with calcareous water) to create a wet environment congenial to plant hydrangea, but being aware of the fact that excessive moisture can encourage the growth of molds and parasites.

Reproduction: The hydrangea is multiplied by cuttings, which will cut the plant after flowering. We leave to root and will place in a pot or in the garden in fall or spring. The soil should be rich in nutrients and acid. It is also important not to place them in the sun, do best in partial shade. In addition, the ground must be moist, but at the same time, have good drainage, as waterlogging are harmful. If we live in a cold, the inside will safeguard or in a sheltered place, and who can not stand frost. It also grows well in places not too hot or dry.

Pests and Diseases: Insects affecting the hydrangea are aphids and spider mites. To eliminate the first to apply a specific insecticide, and to fight the second use a miticide.

Diseases are also an obstacle to the development of the plant. Fungi, such as powdery mildew, produce putrefaction of the specimen, and damage to the leaves. One symptom is the appearance of spots. To solve the problem, apply a fungicide. Another disease is chlorosis, which is caused by a too high pH, ​​leading to lack of iron in the substrate. We perceive by the yellow hue they acquire the leaves we are not confused with the changes that occur naturally in the fall. To combat apply a specific product, rich in iron.

Care needed: This shrub needs a lot of water, so we have to water it every day, except in areas where it rains regularly, where you can space it more. It is important to avoid the lack of liquid, since the flowers will fade in a short time. Pruning is also necessary, we will carry out after flowering. For the plant to grow vigorously, add liquid fertilizer to the soil every two weeks during the spring and summer. If we plant the cuttings in pots, after the first flowering hydrangea transplant is necessary. The best time to perform this task after pruning. To not cause leaf drop, we will avoid it when they start to grow, and during the hottest days of summer. As you grow, the foliage takes on more weight and, at times, makes the plant yield. To avoid this, it is appropriate to place several rods that help sustain it.

Source Wikipedia.

Make: NIKON CORPORATION
Model: NIKON D3100
Software: PhotoScape
Exposure Time: 10/1000 sec
F-Stop: f/5.3
ISO Speed Ratings: 400
Focal Length: 68 mm
Date Taken: 2011-07-05 18:26
Metering Mode: Center Weighted Average
File Size: 276 kb