35 to 45 Days to maturity. Brassica juncea. Shuidong Chinese Mustard Seeds. Non-GMO, Heirloom, non-GMO, Cool Season Annual. Shuidong mustard is named after the town where it was first cultivated, Shuidong Town, in Guangdong Province China. The best thing about this mustard variety is the stalks! They are crisp but quite tender and mild, and not super-spicy like some varieties. This variety grows very quickly, maturing fully in about six weeks. These sweet leaves combine well with the stalks for a great stir-fry, especially with some added garlic. Approx 11,900 seeds / oz.