How to Grow Sweetcorn

I started sowing sweetcorn about a week ago using 4 inch pots inside the greenhouse, the seedlings are germinating well in this tropical heat that we are experiencing at the moment. All you need to keep sweetcorn happy until planted outside (wait until the last frosts are over) is a sunny windowsill, they love the heat but need plenty of space so I only sow one seed per pot. A top tip, don’t sow the seed too deep and avoid overwatering to prevent seed from rotting. Sweetcorn is one of my favourite vegetables to grow, not only because it tastes so much better than anything you can buy in the shops but it also adds a touch of beauty to the veg garden, rustling in the breeze, adding height and interest.

Sweetcorn is wind-pollinated so it’s best planted out in blocks rather than single rows. I usually plant a few blocks using 15 or 18 plants in short rows of 3, this way the plants are closer together which helps to ensure successful pollination of the silks. With this in mind I have sown quite a few seeds to allow for failures. It’s possible to grow a few plants in a large pot successfully but expect a low yield. Despite this, even if you only manage to pick one or two cobs, it’s totally worth the effort for the fresh and sweet taste.

However you decide to grow sweetcorn, cook the cobs as soon as they’re picked for the best flavour.

Sweetcorn – Tassels, Silks and Pollination

Our sweetcorn is doing pretty well, the male tassels (flowers) at the top are standing proud and the female silks are starting to show. Now we are coming to the crucial time that could render our first attempt at growing sweetcorn (from seed I might add) either a tasty success or a total failure.

Wind pollination along with planting in a block rather than a row will help to pollinate the silks, but, I shall also aid nature a little and try to hand pollinate as well. Anyone else done this before? Any tips? So far I have the following advice:

Tap the tassel flower when fully open to distribute the pollen to the silks below, or, run your hand up and down the tassel and then do the same to the silks to release the pollen.


As you can see we have at least 3 silks per plant, whether or not all become pollinated is any ones guess. I have a few pollinating ideas up my sleeve (oh dear that sounds a bit odd) so I shall try different methods on different plants and see how we go.