The earth ring, also known as [1] turnip, is a perennial herb and a tuber of Stachys sieboldii of Labiatae. Tubers are crisp and tender, and can be made into preserves, sauces and pickles, which are very delicious. When eating, it is mainly cold salad, and can also be processed into pickles, canned food, sweet fruits and so on. It is one of the famous "eight treasures" and "assorted rice" at home and abroad. Yangzhou canned radish is the top grade of pickles. Chongqing calls it "ground rolling cattle" and southern Shaanxi calls it "ground rolling fish".

Spinach is a perennial herb. There are creeping branches underground, and the top of the tuber expands into a spiral shape when it matures. The stem is erect, 30 ~ 120 cm high, square, with opposite leaves, oval to oblong, with short bristles attached to both sides. Summer flowering, lip-shaped, lavender, cymes; Corolla is about 1.2 cm long, with hairy rings in the tube, upright upper lip, trifoliate lower lip and nearly round middle lobe. Nutlets are ovoid and tuberculate. Such as warm wetlands or waterside.

Wild or cultivated plants are found in all parts of China, few in western Beijing, and most in Hebei and other places bordering western Beijing.

Geosphere is usually made into pickles, which are crisp and delicious, and are good dishes for next meal. Many Korean residents use it to make kimchi.