Hint: Green
The answer to this puzzle is:
1. ROMAINE
2. TREE
3. BOTTLE
4. LIME
5. AVOCADO
6. LIGHT
7. SNAKE
8. OLIVE
9. SHAMROCK
10. FOREST
11. MOSS
12. PEAR
2. TREE
3. BOTTLE
4. LIME
5. AVOCADO
6. LIGHT
7. SNAKE
8. OLIVE
9. SHAMROCK
10. FOREST
11. MOSS
12. PEAR