Sweet Corn Genetic Compatibility and Isolation

If growing sweet corn wasn't enough of a challenge at times, throw in multiple corn types to add to the challenge!

If you see below, genetic corn types in the same column in the same colored box can be grown next to each other and good tasting corn will still happen!

Isolation by corn type is vital to achieve the expected quality of your sweet corn. Separate genetic corn types (color coded columns below).

Always separate genetic types to avoid cross pollination. However, sometimes it needs to be done—so here are some helpful tips on pulling it off:

  • Minimum distance of 250 feet between types
  • At least 2 weeks difference in maturity or time of planting
  • A sufficient windbreak (stand of trees, solid fenceline, or similar barrier)
Sweet Corn Genetic Compatibility

Sh2 (Supersweet, Extrasweet)

Supersweet (Sh2)
Shrunken-2 (Sh2) gene. Highest complex sugar levels and extended flavor. Starch conversion at the sugar stage slows, resulting in the longest shelf life and sweetness retention. Kernels are crunchier and firmer, even after refrigeration. 60–65°F minimum optimal soil temperature for germination.
Supersweet (Sh2i)
Sh2i gene is improved with low seed density and better plantability. Improved emergence and vigor.

SE-Sh2 (Synergistic, Triplesweet)
SE-Sh2+ (Synergistic Plus, Quadsweet)
SE & SE-SE (Sugary Enhanced)

Sugary Enhanced (SE or SE-SE)
Sugary enhancer (se gene). Improved tenderness, sweetness, and moisture retention, offering better quality than SU. Good germination and vigor in cool soil. Kernels are either “fully sugary enhanced” (SE-SE homozygous) or “partially sugary enhanced” (SE heterozygous — only one parent carries the SE gene). 75% SU, 25% SE kernels.
Synergistic (SE-Sh2)
75% SE and 25% Sh2 kernels, resulting in higher sugars and tenderness with a creamy texture. Converts sugar to starch more slowly, providing a longer shelf life.
Synergistic Plus (SE-Sh2+)
Almost 50/50 SE/Sh2 kernels. Results in even higher sugars and a creamy texture.

SU (Standard)

Standard Sugar
Traditional sweet corn (su gene). Germinates well in cool soil. Sugars convert to starch quickly after peak maturity or harvest.

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