I would probably stick with cocoa butter and vitamin E. If I remember right, those were the 2 main ingredients in the cream I had 18 years ago...and I didn't get 1 streatch mark,
Good luck!
If you have a compost pile you can use that mixed with top soil. Should give you the same effect as the miracle grow without the chemicals.
I'm thinking of adding chamomile and lemon balm to my herb garden this year.