Johnsons' Onion (Spring) White Lisbon Winter Hardy Seeds can be harvested throughout most of the year, providing you with a very hardy strain of spring onions. Slow to form bulbs, these spring onions are ideal for spring and summer sowing but can also be sown up to September so you can use them the following spring. Sow outdoors from February to September ready to harvest from June to November or March to May. Average pack contains 600 seeds. Warning: Seeds should not be eaten. Store out of reach of children and pets. Always read the instructions before use.