'Giant Pascal', also known as 'Pascal Giant', is a French variety heirloom which grows 2 feet high and has light green leaves and 2 inches thick stems with a nutty flavor. With stems this large, make sure the plants are watered adequately, or they will become hollow or dry. Celery is a very thirsty plant, and must have a strong continuous supply of water. Mid-season fertilization will also help. Be on the lookout for slugs, and place traps if they become a problem.