Well Lottie has told you most of it already regarding recognising seedlings. You could ask other plot holders to show you if they have seedlings already coming up so that you can see what to expect and, secondly, if you have similar "seedlings" coming up other than where you placed your seeds then they are most likely to be weeds.

Incidentaly, I am not the only one to have noticed that parsnips this year are even longer than their normal long time in coming up.

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"Always willing to learn"