Currently about 1% (1 in over 100 sown) and some have been in for more than a month. In the past, have had almost 100% germination rate and came up in less than a month. Wish I knew what I did different then...

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Thanks. Does the 'freshness' of the seeds matter? Are you growing them in the same medium and same way?

Same medium, same way using fresh seeds. Have also tried a period of cold in the fridge after advice from another grower but hasn't made any difference. Never tried using seeds from the year before last harvest.