If you wrap your celery in tin foil before placing it in the fridge it will last for weeks, and it will still be fresh and crisp when you pull it out! This also works for stored broccoli for 7 weeks wrapped in tin foil, and heads of lettuce for at least 6 weeks!!!
Freeze green onions in water bottles - shake out the right amount and return to the freezer! This is great! You always have to buy so many green onions and recipes usually never call for more than 3 stalks.