You don't need to. If you prefer, leave the shipping charges portion of your order form empty and we will calculate them for you. You can check the charges on the invoice which we send with your merchandise. If, however, you want to complete this portion of the order form, here's how it works. The relative weights and shipping requirements of the items in each category are different, so shipping charges for products from each category vary.
Seeds are light and compact.
This makes them ideal for Priority Mail shipment. The only exceptions to this are bulk seed items such as seed potatoes, cover crop seeds, garlic and shallots which have their weights provided in the product descriptions. These items ship as hard goods. Plants are perishable and must travel quickly. They always have a scheduled delivery date which you select.