Hydrangea Arborescens Grandiflora or Snowhill Hydrangea
Hydrangea arborescens grandiflora
The generic name, derived from the Greek words hydor, meaning water, and angeion, meaning vessel, refers to the fact that the plant requires abundant water for good growth. One popular group, mainly of hybrid origin derived from Hydrangea macrophylla, is commonly known as hortensia, a name said to have been conferred by the French physician and botanist F. Commerson, who discovered it in China. It was first introduced to Britain in 1789 by the collector Joseph Banks. The genus contains some 80 species found in North America as well as in eastern Asia. They are deciduous, upright, occasionallywith opposite, petioled leaves, generally serrate and rarely lobed. The , borne in terminal cymes, have a calyx with four to five short sepals and four-petalled corolla. The flowering period is from June to September.
Snowhill hydrangea is a native of North America. It grows to a height of 1 to 3 m (3 to 10 ft). The inflorescence is 18 cm (7 in) long; the flowers of the illustrated variety are all sterile whereas in the species only those on the edge of the cluster are sterile. They are coloured white with a yellow-green tinge.
The best method of propagation is by softwood or hardwood cuttings, sometimes also by root cuttings, or seed can be sown in winter under glass. Hydrangeas are grown in loamywith peat or leafmould added. They require a fair amount of water and therefore thrive in soils that do not become dry and in locations that are slightly shaded.