How Trees Survive Winter

Which plant hormone triggers the cells to digest themselves and detach a tree's leaf in autumn?

How much does a tree's metabolic activity drop during winter dormancy?

What sensory trigger tells a tree that winter is approaching?

Why do deciduous leaves turn yellow and orange in the autumn?

What is the name of the protective, cork-like substance that seals a tree's leaf scar after shedding?

What is the primary reason deciduous trees drop their leaves before winter?

What valuable nutrient do trees salvage and store in their roots before leaves fall?

What temperature can a dormant sugar maple tree withstand without freezing to death?

Which autumn leaf color is the most beautiful?