Johnsons' Onion (Spring) Long White Ishikura Seeds produce spring onions that feature slender, long and tender stems. These are bunching onions that can be grown very easily. They are slow to the bulb. The delicious and tender bulbs are suitable for salads and stir-fries. They can be chopped and frozen for use as and when required in cooking. Sow outdoors from March to July, ready to harvest from May to October. The average pack contains 375 seeds.