Used make my sign to do the lettering and basic shapes, would recommend ASA or ABS since they will be in the sun and in contact with moisture.

Currently there's potato, zucchini, corn, peas, pepper, onion, parsley, basil, thyme, carrot, beats (and beets), lettuce, beans, tomato, cucumber, squash, radish, kohlrabi, chives, oregano, garlic, pumpkin, okra and flowers