Your barn fills up with random ingredients very quickly, as we mentioned before. If you can help it, try not to harvest ingredients for recipes you can't even cook yet. For example, the game will let you buy the Egg and Milk shop way before you can even cook anything that uses those two ingredients. Harvesting those ingredients will just cause them to take up space in your barn since you're unable to use them. You can spend coins to increase the storage size of your barn. Unlike the coin storage, the barn storage upgrades become increasingly expensive. Try to balance between buying new appliances and increasing your storage size.