Q.When we bought our black pussy willow about 3 weeks ago, it was
FULL of buds & so healthy. We put it in the ground & the leaves are turning brown & crispy. HELP PLEASE! Also, we have been good about watering it & we put a little bit of Miracle Grow potting soil when we put it in the yard.

Certified GKH Gardening Expert
Make sure the soil is well draining and that it is getting a consistent watering regimen. They like moist soil but not wet. Some leaf loss is expected due to transplant shock.
https://www.gardeningknowhow.com/ornamental/shrubs/pussy-willow/growing-pussy-willows.htm