7. Austree Willows (AKA Hybrid Willow Trees) 50 Hybrid Willow Trees -Fastest Growing Trees in The World - Austree Grow 10 Ft/Yr - 50 Live Tree Plants ...

The trees in question are Austree. The New Zealand Department of Science and Industrial Research created this tree by genetically crossing several types of willows common to that area of the world.

Willow trees can grow in soil that is high in acidity (pH3.7-4) and that is contaminated by heavy metals such as copper, zinc, nickel, chromium or lead.

Oak Ridge National Laboratory / Flickr / CC BY 2.0 Members of the willow family, hybrid poplars are crosses between North America's cottonwoods, aspens, and Europe's poplars.

EPA proposes poplar, willow trees for ethanol in U.S. biofuel rule tweak By Michael Hirtzer October 3, 20164:21 PM PDTUpdated October 3, 2016 ...