Very fast growing - ready in about 45 days. Larger than pak choi. Mild flavor prized for stir fry, salad and fresh snacking. Loves the spring garden, autumn garden or greenhouse. Slow to bolt. White ribs with dark green leaves. 20 heirloom seeds per pack, 100% natural, grown without chemicals. Free shipping on orders over $34. Every seed we sell is certified by us to be chemical-free, non-GMO and heirloom.