Hydrangea hirta

Hydrangea hirta that is commonly known as the 'nettle-leaved hydrangea' is an endemic species that is native to Japan with ranges from its native country to East Asia. Within the conservation levels this species fits into species the least concerned category. Due to the beauty and sturdiness of the species flowers it can be found outside of its range due to being used for horticultural and landscaping  purposes,and is found in gardens and landscapes in a wide variety of countries including the United Kingdom and the Eastern United States. As well as being a beautiful landscaping species for businesses and residential gardens alike, this species have been used in a wide array of research projects and studies that have been conducted at a variety of  Universities in countries around the world including Japan, the United Kingdom, and the United States to name a few. A small deciduous shrub reaching 3 to 4 ft in height. This shrub contains intricate hairy branches that are twisted and bent at opposite angles. The leaves on this shrub are deep toothed, and are covered in stinging hairs. Hydrangea hirta has alternating leaves that are 5 to 8 cm long with an egg shape that comes to a pointed tip. Yellowing and dropping of the leaves commences in August.  As this shrub gets older the branches and leaves begin to smooth due to the loss of the stinging hairs. The flowers of this shrub tend to grow in small clusters that are light blue to white in color. An individual flower of this species measures 5 cm in diameter with 5 petals and 10 stamens; this species lacks the ornamental bracts that many other hydrangea species possess.  Each flower is fertile, and contains an urceolate seeds swell in the middle and begins to narrow at the top within the flower clusters that contain a central stem bearing a single terminal flower that develops first, the other flowers in the cluster developing as terminal buds of lateral stems. At the base of a flower pod the typical forming of the whorl that encloses the petals and forms a protective layer around a flower in bud is fairly small reaching to be approximately 2 to 3 inches across. This shrub is native to the mountain ranges of Japan, and extends from the Himalayas through China to Taiwan.  In Japan the Hydrangea Hirta species is located in the cool-temperate rainforest belt, otherwise known as the Montane Temperate Rainforest. This rainforest belt had a range of 1200 meters in elevation in Kyushu, at 1,000 – 1800 meters in Shikoku, 800 – 1650 meters in Chubum and the lowlands of south Hokkaido. An example of where this species can be located  is in the Tsuga Sieboldii Forest that covers the Pacific side of Honshu and Shikoku where this shrub is a species that helps compose the 20% to 40% shrub cover layer in the lower area of the orotemperate belt.   Hydrangea hirta is a slow growing deciduous species that requires podosolic soils that are more acidic, heavily leached, and moist, with colder and wetter climate conditions. This species is shade tolerant and prefers areas of light shade with partial or full shade. The reproduction of this species is completed by bee pollination with a blooming season that starts in June or late spring and ends in the early summer. However, bee pollination is not the only way this species reproduces, other forms of reproduction for this species includes the  ability to reproduce from the parent stock by the breaking of woody stems, of semi hardwood stems, softwood stems, and the ability to grow new plants from buried aerial stems that will eventually break off and make new plants. Hydrangea is pronounced hy-DRAIN-juh. Hydrangea is Greek in origin, and comes from Greek hudro- meaning “water” and angeion meaning “a vessel” describing to the shape of the cup shaped fruit and the capsule the fruit is contained in. The hirta portion of this species name means “hairy”, and is pronounced HUR-ta. Another name for this species is Hortensia hirta. Hortensia is a Latinised version of the French given name Hortense, referring to the wife of Jean-André Lepaute. The vernacular name for this species is Viburnum hirtum. While viburnum comes from a Latin origin, and means a small shrub or tree within the temperate and warm regions that bare flat or rounded clusters of white flowers. While hirtum is also Latin in origin, and means “hairy” with a thick growth. In Japan the name for this species is ko-ajisai meaning small hydrangea. Hydrangea hirta f. albiflora Hydrangea hirta f. lamalis