Kanzan is one of the classic Japanese flowering cherries - easily recognised by its large size, upright vase-shaped vigorous growth, and the mass of deep pink flowers.
Japanese flowering cherries are often categorised by the number of petals which form the flower, and Kanzan is a typical "double-flower", meaning the flowers have between 25-50 petals. The more petals the more intense the blossom will be, and this is perhaps the main reason for Kanzan's popularity - its flowers can have 8-10 times more petals than the simpler single-flowered forms, giving it a much more profuse blossom display.
The new leaves appear at the same time as the blossom, and are initially a coppery-bronze colour. They take on orange and red tints in the autumn.
Kanzan is one of the most cold-hardy of the double-flowered ornamental cherries, and a good choice for gardeners in northern Europe.
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The flowering cherries offer perhaps the most beautiful and attractive blossom of all tree species. They are usually cold-hardy and disease-resistant, and have some tolerance of poor soils including clay or chalk soils.
There is a considerable choice of size and form, from small compact trees which will suit the smaller garden, to weeping forms, columnar (fastigiate) forms, and large vigorous trees suitable for open spaces. However all flowering cherries are best when planted in a sheltered situation, protected from strong winds, so that the blossom will be as long-lasting as possible.
The flowering cherry season usually lasts from late March to early May - about 6 weeks - although some varieties flower even earlier. The UK Royal Horticultural Society classifies flowering cherries as early-season (late March to early April), mid-season (mid-April to late April), or late-season (late April and into early May). Individual varieties are typically in flower for about 2 weeks.