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Parrotia persica - Growing Guide
Caring for Parrotia persica
Persian ironwood, Iron tree
This is a dense spreading large shrub or, more usually, a smallish spreading tree. The 40 year old tree at Caerhays is around 15-20ft tall with a stunted trunk but horizontal branches which spread 25-30ft. A plant which needs plenty of space in the woodland garden or arboretum. It comes from the Caucasus and north Iran.
It is cultivated firstly for its exceptional autumn colours when its 5in glossy green leaves turn rich shades of orange and crimson and also for its peeling bark. The flowers are tiny and usually appear in Cornwall in late February. They appear in rounded spider-like clusters and are bright red. The flowers are entirely stamens. There are no petals as such but the clusters are surrounded by dark brown bracts and appear well before the leaves so there can still be quite a show of red in the sunshine. If Hamamelis are the harbingers of spring then Parrotias are one of the announcers.
Parrotias are perfectly hardy trees and even the flowers will tolerate quite a bit of frost. Unusually, this tree will grow in chalky soils, but the best autumn colours occur where the soil is neutral or more acidic.
Parrotia will grow from seed sown in the cold frame in the autumn. Cuttings of semi ripe new growth in summer are harder.
Today we can also offer some improved named forms of Parrotia:
P. persica ‘Vanessa’ has a more tree-like growth habit and the young leaves and shoots are a glossy red while the maturing leaves are edged with bronze-red. Foliage colour in spring and autumn!
P. persica ‘Persian Spire’ is a new introduction with purple shoots in spring and, right through the summer, the dark green leaves have a pronounced purple border. The autumn colours are yellow orange.
We sometimes have a few plants available of the rare Parrotia subaequalis. This is a new species from China which only arrived in the UK in 2000. It has proved difficult to get established at Caerhays until recently. In the wild it grows to around 30ft with crimson and scarlet autumn colour. This is similar to P. persica but the tree grows in a more upright habit or so it looks at this early stage.