And if you train at cirrus, compound vine grass together. And compound whatever comes out with the same kind. So you may get common grass from the compound, then compound 2 common grass together.

By doing this, you can get lots of purple grass, or even fire boots!!! I got like 8 purple grass and 1 fire boots in roughly 5 hours of trainning, with alchemy lvl 5. Purple grass and fire boots can make awesome bows.

Alternatively, you can recycle vine grass, and get straw mushroom. Compound straw mushroom with turpentine, and you will most likely get tomato juice, Sp +150!!! just as good