Fresh Seeds inside US, Fast shipping Oriental mustard greens are very popular in Chinese, Indian and Vietnamese cooking and pickling. Mustard greens are resistant to low temperature and grow best in temperate/cool climates, but not good in warm conditions. Seeds are sown in early spring and fall. Some varieties may form heads or semi-heads in cold climates. Mustard has a mild flavor that will increase in pungency as the plant matures. Customer Service: Your success is our success. If you feel like you cannot leave us a 5 star rating or if you have any issues with your order, like damaged or wrong items etc...just send us a note and we'll promptly resolve the issue for you. Free Shipping: Seeds are packaged in a small poly bag. In an effort to keep costs low, and pass the savings onto you, we do not offer specific planting directions on seed packets. If you cannot locate planting instructions for your specific conditions, contact us and we'll do our best to instruct you on the proper methods. There is no tracking number for economy shipping. Economy shipping order usually takes 1-2 weeks to arrive depending on the state you live. If you want seeds to arrive faster and safely with the tracking, it is HIGHLY recommended to choose USPS Ground Advantage.