How to Grow Synergistic Sweet Corn


Developed with a crunchy texture and sweet corn taste that holds longer after harvest than other sweet corn types, synergistic sweet corn retains good eating quality for 10 to 12 days after harvesting if properly stored. Plant synergistic sweet corn on or after the average date of the last spring frost in your area, when the soil temperature is at least 50 to 55 degrees F.

Step 1

Choose a spot to plant synergistic sweet corn in fertile garden soil and full sun. Allow enough space to plant a double row, rather than one long row, as pollination rates are higher when sweet corn is planted in double rows.

Step 2

Add a high phosphorus fertilizer, such as 10-25-10, to the planting bed prior to sowing seed. Broadcast it at the rate of 1 lb. for every 1,000 square feet of planting bed. Incorporate it into the top 3 to 4 inches of soil by tilling or turning the soil over with a spade. Rake the surface of the soil smooth.

Step 3

Plant seeds of synergistic corn 1 inch deep if you have clay soil, 1 1/2 inches deep in loam soil and 2 inches deep in sandy soil. Space seeds 6 inches apart in rows 24 inches apart. It is not necessary to separate synergistic sweet corn from other varieties, as cross-pollination will not adversely affect either type.

Step 4

Water the seedbed by misting it with a hose-end sprayer. Check it daily and mist as needed to keep the seedbed moist.

Step 5

Thin the seedlings to stand 12 inches apart when they are 2 to 3 inches high.

Step 6

Cultivate regularly to control weeds. Corn is shallow-rooted, and it is necessary to cut the weeds off at soil level with a garden hoe or pull them out by hand.

Step 7

Irrigate as necessary to provide corn with the equivalent of 1 inch of rainfall per week using a sprinkler or soaker hose.

Step 8

Harvest synergistic sweet corn when the silks have turned brown. This generally occurs approximately 2 to 3 weeks after their emergence. The kernels should exude a milky substance when punctured with a fingernail. Break the ears off the shank as close as possible to the ear.

Step 9

Remove the field heat immediately after harvesting by plunging into a 40-degree-F water bath or refrigerating. Synergistic sweet corn should be cooled to approximately 32 degrees F within an hour of harvesting, to prolong its storage life. Store at normal refrigeration temperatures.

Things You'll Need

  • High phosphorus fertilizer
  • Garden spade or rototiller
  • Garden rake
  • Garden hose
  • Spray nozzle
  • Garden hoe
  • Sprinkler or soaker hose


  • University of Minnesota Extension: Growing Sweet Corn in Minnesota Gardens
  • New Mexico State University Extension: Home and Market Garden Sweet Corn Production
Keywords: grow synergistic corn, synergistic sweet corn, plant sweet corn

About this Author

Sharon Sweeny has a college degree in general studies and worked as an administrative and legal assistant for 20 years before becoming a freelance writer in 2008. She specializes in writing about home improvement, self-sufficient lifestyles and gardening.