Eating leaves, dried grass, and everything else

I have a 10 mo old monster. He requires near constant attention and it is driving me nuts. He loves to play outside, but he will not stop eating dried leaves/grass, pine needles, dirt, sand, rocks, ect which he ends up throwing up later.

When indoors he will still try to eat everything, but at least I can monitor the environment better.

He has loads of various toys, bones, food, enrichment activities, ect. I literally can't walk out of a room without him doing something he isn't supposed to (including chewing on walls). He has to be crated whenever I can't be in the room.

Any advice? Picture of said monster for tax.