Corn, King Kool Hybrid
Early-planting, early-harvesting supersweet corn!
Days To Maturity
After Last Frost
Plant Shipping Information
How to Sow
- Growing corn is easy provided you have enough space and plenty of sun. Corn is wind-pollinated, so you need to plant in blocks to ensure pollination. You should have a minimum 10 foot by 10 foot area. The exception to this rule is ‘On Deck’ corn, which has been bred to grow in containers. If you are growing ‘On Deck’, choose a container that is at least 24 inches wide and deep and plant nine seeds evenly spaced.
- Isolate corn varieties when recommended (Sh2s), by planting corn seeds at least 250 feet apart, or select varieties that mature at least 2 weeks apart so they will not cross pollinate.
- When choosing a site for corn plant on the north side of your garden so the tall plants do not shade other plants in your vegetable garden.
- Corn is a warm season crop and should not be planted in cool soils. The non Sh2 varieties tend to be more tolerant of cool soils, but in general the soil should be about 65 degrees F or warmer.
- Sow corn seed 1 inch deep, 5 to 6 inches apart in rows 2 to 3 feet apart.
- Seedlings emerge in 7-14 days.
- When corn seedlings are 3-5 inches tall and healthy, thin to 1 foot apart.
How to Grow
- Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their seeds from germinating.
- Keep plants well watered during dry periods to promote uninterrupted growth. Corn needs 1-2 inches of rain per week for best production. Use a rain gauge to check to see if you need to add water. Corn is also a heavy feeder and will benefit from side dressings of fertilizer applied as directed through the growing season.
- Monitor for pests and diseases. Check with your local Cooperative Extension Service for pest controls recommended for your area.
- Suckers tend to form at the base of the plants; they help support the stalks and make food for the plant. The stalks may have to be staked in windy areas, but in general they are self-supporting.
- Sunflowers are good companion plant for corns. Direct sow sunflowers in rows parallel to corn rows to help separate corn varieties that need isolation from each other. Choose sunflower varieties of comparable height to the corn plantings. The sunflower border, with vibrant hues in russets to golden-yellow, will add sparkle next to the almost all-green corn plot. The ‘Three Sisters’ (corn, bean and squash) are traditional companion plantings with Native American gardeners.
Harvest and Preserving Tips
- Ears of corn are ready to harvest about 17-20 days after the silks appear. The kernels should be firm. Open an ear and pierce a kernel with your fingernail. If the liquid is watery, the corn is not ripe yet. It should be milky. If it is creamy, it is overripe and will not taste as sweet.
- Firmly grip the ear and twist downward to harvest. Take care not to break the plant when harvesting the first ear, or the second ear will not develop. Most corn produces two ears.
- Store unhusked corn in the fridge and consume as soon as possible. Sh2 and SE varieties keep the longest in the fridge, up to one week.
- Corn freezes well after blanching and may also be canned using a pressure cooker. Immature ears may be pickled.
Days To Maturity71-73 daysFruit Size7-8 inchesSunFull SunSpread12 inchesHeight5-6 feetSow MethodDirect SowPlanting TimeSpringSow TimeAfter Last FrostThin9 inchesLife CycleAnnual
Corn, King Kool Hybrid is rated out of 5 by 9.Rated 5 out of 5 by JokerJim from Amazing corn This is nothing short of spectacular, truly. I dropped 49 seeds, 10 did not germinate so put in new seeds in the same spot and they all grew. I grow everything in raised beds here and filled up a 4' x 8' bed with 7 rows with 7 stalks in each. I think I might have tried it too early. Anyway, all grew just fine and picked 6 ears yesterday. Cooked them up and had them for dinner last night. They may have been the sweetest corn I have ever eaten. I was picking them off still raw and all you taste is sugar. Spectacular taste and I highly recommend this variety.Date published: 2015-07-20Rated 5 out of 5 by grandpa1948 from Every bit as good as described I planted King Kool two weeks before and right beside my Burpee's Ambrosia patch, in four 40' rows. I planted the seeds about a foot apart and never did get around to thinning; the only thing that caused was a bigger harvest. I really don't recommend planting that close together for everyone because I am bless with exceptional alluvian soil and long hot summers with an abundance of sunshine, just what corn needs. Although it is supposed to be about the same time to maturity as the Ambrosia, they came in together. Wow! gave me a busy time getting them all harvested before they got too full, but I needn't have worried because; although it took a little over two weeks to harvest and process, the ears were still as tender and sweet at the end of harvest as they were at the beginning. We had a terrible wind storm here in Kansas, imagine that, that laid about half of both crops on the ground just as it was beginning to pollinate; no problem, I didn't lose a single ear, and all were fully developed showing that complete pollination occurred. Plants were 6'-7' tall with ears 10" long for the primary and 8" for the secondary. Flavor was exceptionally sweet, but not in the class with Burpee's Ambrosia. Since we have a warm early spring and long hot summer, I think I will stay with the Ambrosia, but I strongly recommend The King Kool for anyone with a late spring or short summer. You will be more than pleased with the hardiness and the satisfying sweet, corn flavor that you've waited for all winter.Date published: 2014-10-06Rated 4 out of 5 by TerrieP from Great Flavor Ears were small and harvest was late (planted memorial day, harvest 9/7/14) but flavor was amazing. Very sweet corn, best I've tasted this season!Date published: 2014-09-09Rated 1 out of 5 by Gonzo1513 from Kool KIng This corn is sweet but I am at day 83 and have had 1 ear and the ears are very tiny still not a good grower in my eyes.Date published: 2013-07-11Rated 5 out of 5 by Katalou from Good producer Planted a patch of King Kool in 2012 from leftover 2011 seed. Good propagation and had plenty for fresh eating and to freeze.Date published: 2013-04-02Rated 5 out of 5 by Bunzoid from sweet and tasty Crispy, sweet, wonderful! Freezes very well, too.Date published: 2013-01-06Rated 5 out of 5 by Floydville from Sweetest corn ever. Very sweet and easy to raise. I ate lots of it in the field. Don't tell my wifeDate published: 2012-05-09Rated 5 out of 5 by Noah from Grew very well throughtout the season I grew this variety for the first time last year. The King Kool was the first variety I have tried that tastes great and successfully matured with early and late plantings. I have previously grown Illini Xtra Sweet, which tastes great but only one or two plantings (10 days apart) can mature during my growing season. Northern Xtra Sweet grew well but doesn't taste as good. I am at a higher elevation so although zone maps place me in zone 5, my soil is cooler and growing season shorter than a typical zone 5. I made 6 small plantings of King Kool last year, each spaced about 10 days apart, and every one matured well. I'm definitely growing it again this year!Date published: 2012-01-23