Hint: Green
The answer to this puzzle is:
1. LIZARD
2. TREE
3. IVY
4. PARSLEY
5. LIME
6. GRASS
7. FOREST
8. SHAMROCK
9. ROMAINE
10. FERN
11. JADE
12. TURTLE
13. CELERY
2. TREE
3. IVY
4. PARSLEY
5. LIME
6. GRASS
7. FOREST
8. SHAMROCK
9. ROMAINE
10. FERN
11. JADE
12. TURTLE
13. CELERY