Q: We have a large tree-form lilac that needs to be trimmed back quite significantly. I can’t trim very far before I cut off a lot of leaves. What’s the best way to do this? Should I be concerned that ...

The cooling effect of pollution may have been exaggerated. Fossil fuel burning spews sulfuric acid into the air, where it can form airborne particles that seed clouds and cool Earth’s climate. But ...

The growing recognition of how trees communicate with one another is a 21st century phenomenon which has revolutionised how we think about forests, woodlands and the individual trees which populate ...