Radish varieties will cross-pollinate so try to save seed from only one variety per season. Radishes are easy to save seed from and will produce seed the same year that you sow them. Keep aside one or two healthy plants and and allow them to produce seed stalks. The stalks can grow surprisingly large and bushy so allow sufficient room, about a 45cm, for the stalks to fully develop. The seed pods become pale brown and the stalks should be cut down when both the pods and stalks are dry and hard. The seeds can be removed either by cracking open individual pods or grating the pods through a sieve and then winnowing away the chaff to leave the seeds in a stiff breeze. Allow to dry for a few days before storing in a cool and dark place and your seed you last up to five years.
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