枠 boundary / limit

木 (tree) + 九 (the number 9) + 十 (ten)

★☆☆☆☆

8 strokes

Onyomi

You got the 9 radical, and the 10 radical, so think '90'. As in, You're limited to cutting down 90 trees within the boundary of the forest.

わく	literally, a frame (write you name in this box, etc.). More often used figuratively, a numerical limit: you can use this library card 3 times a month. You can only bring 5 friends with you to the pool. Etc. ★☆☆☆☆