Are Marconi sweet peppers? I don't know anything about them, I'm afraid. 2016 seeds shouldn't be too old but it depends on how they were dried out and stored - assuming they were viable in the first instance - they might not have been.
I've had variable results this year - seeds from late 2017 (so only just over a year old) haven't germinated but some much older have done.
I've had variable results this year - seeds from late 2017 (so only just over a year old) haven't germinated but some much older have done.
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