Mizuna Mustard is a culinary green that has great leaves for salads. Each plant grows up to 36 inches tall. Mustard seeds can also be used as a spice or can be ground to make condiments. The Mizuna variety is a fast-growing type with dandelion-type leaves that are perfect in salads. It can be gradually harvested or the whole plant at once. This was once only used as a garnish but now is popular for its nutrient-packed leaves.