Generally, the more dormant the parents in the cross, the more they need chilling, and vice-versa. However, the reason I refrigerate my seeds immediately after harvest/drying is that it improves germination. I have successfully germinated daylily seeds that were refrigerated for five years. If you start your own tomatoes each year from seed, put the remaining seeds in the refrigerator. You can even keep them in the freezer. Refrigerated tomato seeds will germinate even after nine years in the cooler. With today's price of seeds--it is well worth the space in the crisper drawer.
