Posted: 04/02/2014 at 11:53
Yes you do need seeds, but if you shop around you can usually find some great bargains.
And of course you can grow your own seeds. I always leave a few coriander, rocket, mizuna, watercress plants and others to bolt, flower and set seed. Beneficial insects like hoverflies love their flowers, feeding on their pollen and nectar. By the end of the summer you'll be able to collect masses of seed ... for free!