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Lesley-I have never tried sterilising the actual seed, but I always zap the compost in the microwave for a few minutes prior to planting in pots that have been soaked in boiling water. The compost is always wet when I zap it to avoid the need to water with unsterilised water, when it cools I sow the seeds and put the pot into a zip-up bag as shown. Then I just keep an eye on them and remove any seed with signs of mould.