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It's still a bit early to sow sweetcorn. You can start in mid-April, and at that time you need to do it under glass as it needs warmth to germinate. 'Lark' , 'Earliking', 'Golden Bantam' and 'Earlybird' are all tried and tested early varieties. Pick one variety to grow at a time. You could be harvesting the crop from around August / September. Have a look at our project on growing sweetcorn and Adam's blog for some tips.
Did you sow two seeds in each pot? if so remove the weaker plant. If they are big plants then it may be easier to just cut the weak one off at soil level instead of damaging the roots trying to remove it.
Thanks for that, fidgetbonesThey were single plants so I'll do it with a sharp blade to cause least disturbance.