A species of old-growth tree that is totally new ... encountered a 40-meter- (130-foot-) tall 'unarmed' stranger. The monstrous tree in their path was unlike any that the group had seen before in ...

an ISA-certified arborist and owner of Urban Forest Pro. "The one big advantage for gardeners is that the tree will not change the pH of the soil the way a lot of evergreen needles will," she says.

Tropical rainforests have an emergent layer of tall trees over 40 m tall ... including evergreen rainforest, seasonal deciduous forest, tropical cloud forest, and mangrove forest.