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when is the best time to plant out corn and how big do you leave them before you do so i tried 18 plants about an inch and a half ive lost three but have re sowed 20 and there in my cold green house was wondering and how long do they take to grow befor cropping them first time for corn sorry live in south wales 

hi dialeg,
I would suggest not to plant out any sweetcorn until early june, Late may if warm enough. Keep them in your greenhouse until they about 6" high. Depending on what variety, you should get a crop mid to late august, Keep them well watered and feed weekly with a slightly weaker tomato feed than you would tomatoes. The cobs are ready to harvest when the tassles growing out of the top of each cob, turn brown. Pull back the layers and do the thumb nail test, but more on that nearer the time.

thanks for the infomation i will keep on trying all of my other stuff is doing fine i thought i put them out toearly just too keen trying to get them in the ground so id have a bigger plant mmm maybe theres somthing init ill let you know as i will have too lots of planting

If they get checked in the pots it will delay their growth... 3-4" is about right for going out. Ours has just germinated in the last couple of days

I have had really poor germination on the first sowing of sweetcorn. We only have 4 plants! Would I be okay to plant these in a square and give them a good shake for pollination, or is this just a stupid idea? Obviously I will isolate them them away from other sweetcorn varieties as we have 2 plots.

It would be better than nothing... can you not get another packet of the same variety?  :-\