Courtesy of MShades/flickr
Hydrangea is a genus of about 70-75 species of flowering plants native to southern and eastern Asia and the Americas. The flowers are extremely common in the Azores Islands of Portugal, particularly on Faial Island, which is known as the "blue island" due to the vast number of hydrangeas present on the island. By far the greatest species diversity is in eastern Asia. Most are shrubs 1-3 m tall, but some are small trees, and others lianas reaching up to 30 m by climbing up trees. They can be either deciduous or evergreen, though the widely cultivated temperate species are all deciduous.
Hydrangea flowers are produced from early spring to late autumn; they grow in flowerheads (corymbs or panicles) at the ends of the stems. In many species, the flowerheads contain two types of flowers, small fertile flowers in the middle of the flowerhead, and large, sterile bract-like flowers in a ring around the edge of each flowerhead. Other species have all the flowers fertile and of the same size.
In most species the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, or purple. In these species the exact colour often depends on the pH of the soil; acidic soils produce blue flowers, neutral soils produce very pale cream petals, and alkaline soils results in pink or purple. Hydrangeas are one of very few plants that accumulate aluminium. Aluminium is released from acidic soils, and in some species, forms complexes in the hydrangea flower giving them their blue colour.
Species in the related genus Schizophragma, also in Hydrangeaceae, are also often known as hydrangeas. Schizophragma hydrangeoides and Hydrangea petiolaris are both commonly known as climbing hydrangeas.
Growing Tips- Early Fall is the best time to plant new Hydrangeas.
- Choose a location that gets full sun to partial shade with rich, well draining soil.
- When planting, surround with plenty of compost and add a general fertilizer monthly throughout the season.
- Water regularly for rich, moist soil to ensure large blooms.
- Prune branches for a full, bushy appearance. New flowers only form on the tips of new growth, so any stems which have already bloomed can be removed.
- Once the season is over, you can prune the plant back to the ground.
Courtesy of ptrktn/flickr
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06-04-2008, 10:44 AM
