51�Թ�

He told the BBC it was essential that they are well watered "to encourage a deep root system".

When the flames are intense enough to destroy root systems, they also change the soil structure.

Young saplings need moisture to build strong root systems, and the wet weather also relieved stress in some older trees which had been suffering during the parched weather.

This molecule activates a regulated cell death in plants, enabling the fungus to colonize the root system.

Without prompting he'll enthusiastically offer up fun facts about the Golden Gate Bridge, the subject of his book, or the root system of a sequoia.