Are mimosa shrubs/trees acid loving? Would Westland grosure, all purpose compost be suitable for mimosa?
Certified GKH Gardening Expert
Mimosa do prefer a acid soil in the 4.4 to 5 ph range.
A soil test will help you determine if you need soil amendments.
Your County Extension service can help you with a soil test for a few dollars.
Here are some links to help you.