[Diddy Gardener]

This year I plan to grow sweetcorn in the greenhouse - had zero luck outside... going to grow half a dozen or so and group them together. My question is, what size pots would be best for them?

[Aunt Sally]

They are very hungry, thirsty plants so I'd say the bigger the better.

[Diddy Gardener]

Excellent - thanks Aunt Sally 

[Goosegirl]

I've posted on here a few times re- growing sweetcorn in the GH. Though I started growing them outside and had some crops, I had two years without any cobs at all.    GH it was, and they have been a huge success. I interplant them with dwarf French beans which, along with climbing French beans (you only need one of these per GH as it grows like a triffid) were also successful. I have a raised bed on one side of the GH so plant directly in the soil. Their roots don't seem to go down that far when I hoick them out, so I would get as big a diameter pot as you can and place on a solid watering tray. Use a good general purpose soil-based compost and add chicken manure pellets when growing strongly.

[Aunt Sally]

Pollination is by wind so you will have to be very particular about making sure you you shake the plants frequently at the right time.

[engineer]

I grew sweetcorn in my polytunnel last year very easily as long as you can keep the water going in, as to pot sizes go to Wickes or B&Q and buy the builders buckets, 99p and £1 each, best large pot available