Fall pruned evergreens are more susceptible to winter injury.

Needled evergreens such as spruce (Picea) and fir (Abies) are best pruned in late winter before growth begins. Arborvitae (Thuja) and yew (Taxus) can be pruned during spring and early summer. Sep 29, Pruning and Shearing Time Frame. Shear and prune a yew tree in the late winter or early spring. Begin pruning prior to new growth commencing and as soon as the soil is no longer frozen for best results.

Refrain from pruning a grown yew tree past the middle of June, because late season pruning removes the tree's new growth. Younger trees, if pruned correctly and in time, throughout the year, will grow out to be way healthier and hence will require lesser pruning when matured. Evergreen Shrubs Prune the shrubs such as juniper and yew until new development starts in late March or early April. Yew is a tree that loves pruning and can even be shaped to whim as topiary.

If not pruned, your common yew can grow over 65 feet (20 meters) tall for the tallest species. For yew hedges, select the pruning height you are comfortable with as well as the thickness.

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Pruning the yew is best at the end of summer or at the beginning of spring. May 25, But trimming trees can be a tough job. You don’t want to waste all your energy only to prune at the wrong time of year. Focus those efforts on pruning at the ideal time. Aug 10, Probably the best time from the standpoint of the health of a plant is to prune in late winter or early spring just before new growth resumes for the year.

Some will only grow to half a metre, whilst others will reach 20 metres.

However, there are exceptions depending on when a plant flowers or other characteristics (such as sap “bleeding” on maples) that may require pruning at other times of the year. Hemlock trees should be pruned as you would a yew. Late winter into early spring. Then again after the new growth has develop in early summer. It is advised not to prune after mid-summer because the new growth that is promoted with the pruning will not harden off in time.