Question
When is best time to start branch is water, spring or fall.  And how to care for it at 1st planting?  I live in SE Missouri.

Answer
The spring is best. After the cutting has a good bit of roots on it you can genteelly move it to either a pot with potting soil or to the location you want it to grow. If you plant it out use potting soil to fill the hole and make sure you water every other day. Mulch around the tree with not more than 3 inches of organic mulch not piled up on the twig. Willows like moisture and this will help hold the moisture around the roots.