Q.Can I Create New Plantings By Placing Trimed Branches In A Pail For Root Growth? Japanese Maple
can you start a new tree by cutting off 18in. 0f new growth from a japanese maple and placing it in a pail of water for new roots ?

Certified GKH Gardening Expert
18 inches is a little too large of a cutting to take. Take a smaller cutting for better results.
If you do choose to take a hardwood cutting, you should do this during dormancy.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/cuttings/root-stimulating-hormone.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/cuttings/honey-root-hormone.htm