Growing Sweet corn, also corn,maize

Zea mays, var. rugosa : Poaceae / the grass family

Jan F M A M J J A S O N Dec
        P P            

(Best months for growing Sweet corn in USA - Zone 5a regions)

  • P = Sow seed
  • Sow in garden. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 61°F and 95°F. (Show °C/cm)
  • Space plants: 8 - 12 inches apart
  • Harvest in 11-14 weeks.
  • Compatible with (can grow beside): All beans, cucumber, melons, peas, pumpkin, squash, amaranth
  • Avoid growing close to: Celery.

Your comments and tips

02 Nov 14, Nives Walker (Australia - tropical climate)
Should you remove the shoots which grow from the base of the main plant??
12 Nov 14, Brad (Australia - arid climate)
I would not remove them as they are tillers or extra extentions of the original plant that will produce extra cobs. More tillers = more cobs
24 Oct 14, Bev Anderson (Australia - tropical climate)
Our corn is very attractive to 2 different bugs at present. A brown bi-coloured bug with long proboscis and a green bug. They seem to suck on the kernels and then the kernel turns brown. How should they be treated? Many thanks
26 Feb 15, Graham (Australia - tropical climate)
I would use chilli or garlic oil Chilli would be the best
24 Aug 14, Anna (Australia - sub-tropical climate)
Has anyone grown gem corn? Know where to get seeds?
14 Sep 14, Kbot (Australia - temperate climate)
Try here: • Diggers • Eden Seeds or if you are in WA try Merri Bee Farm Happy gardening :)
21 May 14, Philip Nel (South Africa - Semi-arid climate)
We have a small holding in Koster reign and want to try doing some sweet corn.I have passed by Brits area and noticed they do lots of sweet corn and seems as if they plant during the winter months. Could you share some information on this regard with us?
24 Aug 14, phillip (South Africa - Semi-arid climate)
Plant now dont wait
05 May 14, craig (Australia - temperate climate)
Use pyrethrum for ants, the grubs don't like it much either. It is a safer less toxic option. A fresh chilli mix in water also works but isn't pleasant on a windy day when applying. Try not to be too nosey and open the cobbs for a look as this allows access for pests to get in. Let the silks die down to a dead brown and you will get what you get, leaving them longer wont help they are done.
19 Feb 14, Natalie (Australia - temperate climate)
I am growing corn for the first time and have struck a problem. I planted them in October and noticed the tops have turned brown. I picked some but one only had about 3 kernels and the others didn't have any. They smelt ready for picking too. Did I pick too early?
Showing 261 - 270 of 432 comments

Perth: This impressive crop does take up a bit of room but it's well worth it; the sweetness of fresh picked home-grown sweet corn is hard to beat. Plant from September through to January. Preparing the site Choose a sunny site that’s protected from strong winds. Sweet corn is a hungry crop so it’s important to enrich your soil before planting. Add a plenty of aged manure and a handful of blood & bone per square metre and fork it in well. Sweet corn will do well in a bed that’s previously grown healthy peas or beans. In the right conditions, each plant will usually produce 2 ears of corn. Planting Plant seedlings or seeds (ensure seeds are fresh). Space 30cm apart and plant in blocks rather than a single long row. Planting in blocks assists pollination which is essential for the development of kernels. Plant early and late varieties in separate blocks for a longer season. Water seeds well after planting then sparingly until germination occurs as the seeds can rot easily. When the stalks are about 20cm high, mound the soil up against the stalks. This process, called hilling, encourages more roots to grow which will help stabilise the plant during windy conditions. You can also achieve the same result by planting the seeds in a furrow and backfilling as the plants grow. Watering and fertilising Once the plants are well underway it’s important to ensure an adequate moisture level, especially since the plants will be at their peak of fruit production over the hot months. Drip irrigate if possible and mulch well to retain moisture. As soon as the tassel appears at the top of the plant, give the soil a boost with a granular fertiliser that’s high in nitrogen. Insufficient pollination results in ears of corn with lots of missing kernels. Planting sweet corn in one long single row can result in most of the pollen being blown away, which is why gardeners plant corn in blocks instead.Can be hand pollinated by cutting off a pollen-laden tassel each day and gently brushing over the silks . Sweet corn is ready to pick 2-3 weeks after pollination and it's important to keep up the water during this time.

- Mike

Please provide your email address if you are hoping for a reply


All comments are reviewed before displaying on the site, so your posting will not appear immediately

Gardenate App

Put Gardenate in your pocket. Get our app for iPhone, iPad or Android to add your own plants and record your plantings and harvests

Planting Reminders

Join 60,000+ gardeners who already use Gardenate and subscribe to the free Gardenate planting reminders email newsletter.


Home | Vegetables and herbs to plant | Climate zones | About Gardenate | Contact us | Privacy Policy

This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
We cannot help if you are overrun by giant slugs.