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Why does sap rise in spring?

Pruning deciduous trees should be avoided during spring because the sap is rising – but what does this actually mean?

Charlotte Varela  •  20 May 2024

Trees woods and wildlife

Nightingale

Nightingales are relatively dull in colour but they are famed for their rich and distinctive song.

About us

Conservation research grants

We fund applied and policy driven research that addresses issues facing the conservation of the UK’s native woods and trees. We welcome research proposals that address our priority research themes and will help us to achieve our strategic goals: to protect, create and restore native woods and trees, for wildlife and for people.  

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Ausewell Wood appeal, Dartmoor

With its dramatic rocky outcrops, raw and rugged beauty, and precious, endangered wildlife, Ausewell Wood is the lost world that needs your help.

Trees woods and wildlife

Lime, small-leaved

Charming, sturdy, pollinator-magnet. Not only does the small-leaved lime’s blossom produce a sweet scent and pleasantly minty honey, its leaves support the caterpillars of moths such as the lime hawk, peppered and vapourer.

Trees woods and wildlife

Bristle mosses

Bristly, spongy, and very sensitive to pollution, the bristle mosses are true tree lovers. Whereas most woodland mosses grow on the ground, look for these on tree trunks, branches and twigs.

Trees woods and wildlife

Buzzing spider

Keep a keen ear out for this leaf-lover with real rhythm. Look for the buzzing spider on leaves and stems of deciduous trees and shrubs in woods and parks.

Trees woods and wildlife

Forest bug

A living woodland crest, the forest bug is a shieldbug that loves nothing more than the sap of oak trees. Look for them on woodland edges in the summer.