We show you how to prune a congested tree to improve its health and form.
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Crown thinning involves pruning out a small number of larger branches in the crown of a tree to allow light to filter into the canopy.
It’s also a good idea to remove up to a quarter of the thinner branches from the crown on a regular basis to allow air to circulate through the tree, reducing problems with pests and diseases.
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RHS Chelsea Plant of the Year in 2011, this beautiful shrub blooms for months on end, with white flowers which have striking blue backs. Best suited to beds and borders, in full sun or partial shade.
Part two in the series, this online Masterclass and live Q&A will teach you how and why to prune your plants in summer. Tickets £15 (or save 15 per cent on series).
Named Plant of the Century at the 100th RHS Chelsea Flower Show, this reliable and easy to grow perennial flowers prolifically from June to October with blue, saucer-shaped blooms.
