Purchasing bone meal

Q: Is it permissible to use bone meal as compost when planting trees, etc.? Bone meal is made from dried and crushed or powdered animal bones. It could be from any animal. When planting, it is thrown on the roots with manure and then covered. It could be sprinkled on the plants as well.

Girls family not pleased with proposal

Q: I am in a love with a girl for the last 7 years. I asked my mother to go there and ask for rishta. We all went to her home and gave our proposal. They said they shall let us know a week later. After a week they invited us to their home and said we are fine and said Yes for marriage. Before going there me and my mother perform Istikhara and it was good but after saying yes they perform istikhara but saw negative signs. I asked a Mufti and he said you cannot perform istikhara after saying Yes. Please tell me what should I do?