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Yew

In the UK, there are three native conifers: the Juniper, the Scots Pine and the Yew (Taxus baccata). The genus Taxus contains some eight species, seven of which are found in the Northern Hemisphere.

The Yew is said to be slow growing and can be of great longevity. Some Yews (e.g. the Fortingall Yew), are probably thousands of years old. Estimating the age of a Yew can be difficult as they develop hollowtrunks;  dating by annual rings is next to impossible.  These trunks may also fill with aerial roots that grow down from the crown.

Yew is to be found naturally on many soil types, though it is perhaps more common on chalk in the south east and limestone in the north. It is also found in the shade of oak woodlands, and during the last 300 years it has been widely planted in parks and gardens – as yew hedging. Ancient or veteran trees are often associated with church-yards and have been connected with other sacred places.  One site that offers a lot of information about the Yew is the Ancient Yew Group.

Yew leaves arranged in rows

Leaf

The leaves are long and narrow – technically described as lanceolate, that is like a lance, tapering to a point at the tip.  They vary between 1 and 4 centimetres in length, and 2 to 3 millimetres wide.  On many shoots they give the appearance of being arranged in two rows either sides of the stem, but on upright stems the spiral arrangement of the leaves is more obvious.  On horizontal, ‘flattened’ stems the base of each leaf twists so that the leaves have the two row appearance.  The leaves are generally a dark green colour, sometimes a blue-green though the underside of the leaf is ‘lighter’ in colour.

Like nearly every part of the tree, the leaves are poisonous containing the alkaloid taxane.

Chemicals extracted from the leaves are now used in the treatment of certain forms of cancer, where the toxic effects of the chemical slows down the multiplication of cancer cells.

Buds, Bark and Stem

As the tree grows and mature, the stem (bole / trunk) developes a distinctive character. Its bark is trelatively thin, with a brown scaly appearance, small flakes may be seen along the stem.  As the tree grows and matures, the trunk may develop furrows and ridges – see adjacent photos.

The wood of the tree has had a number of uses through history and pre-history. The earliest known use is as a thrusting spear from the Hoxnian inter-glacial period, which is many hundreds of thousands of years ago!

The burial ship at Sutton Hoo contained a Yew bucket; and the wood was much favoured in Norman times for the making of long bows. Its use in bow making may pre-date this by some thousands of years as evidenced by the ‘Ice Man’ found in the Alps. It has been, and is still used, in furniture making and is much favoured by wood turners. Its water resistant qualities mean that it has been used for house foundations in places like Venice.

Flowers and Fruits

The Yew tree is dioecious (that is, it has male and female forms). It can take many years for the female form of the tree to bear flowers or fruit.

Male flowers or rather cones shed their pollen in early spring.  Female trees are most readily recognised when they bear their red fruits. Each cone is modified to contain a single seed / fruit.



yew-arilThe outer part of the fruit is a red, fleshy cup or aril – it looks a bit like a berry at first sight, which attracts birds. The aril is the only part of the plant that is non-toxic. Within the fleshy aril is a hard brown nut, which is distributed by birds such as thrushes and waxwings (the hard seed passes through their digestive system).  Like the leaves, the seeds are highly toxic.

Winter Twigs

As the yew is ‘evergreen’, it does not change its appearance greatly over the seasons, but it does shed leaves but not on a seasonal basis.  They are replaced throughout the growing season.  Leaves are lost as they age, or subject to attack by various pests from insects to fungi.

The tree can assume a broadly conical, elongated triangular shape, but can also be cylindrical or flattened and spreading.

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