Standard Sweet Corn (su)
Zea mays var. saccharata
The old-fashioned corn flavour, and it starts turning to starch within hours of picking.
The classic flavour
Standard sugary varieties - Silver Queen, Golden Bantam, Country Gentleman - have the deep, creamy, genuinely corny flavour that older growers mean when they say sweet corn tastes different now. They are less sweet than modern types but more flavourful, and the kernels have a tender pericarp.
Eat it the same day
su corn converts sugar to starch fastest of any type - meaningfully within a few hours of picking. The traditional advice to put the pot on before you go to the garden is literally about this type. If you cannot cook or freeze it the day you pick it, grow se or sh2 instead.
Best seed vigour
su seed is plumper and germinates more reliably in cool soil than se or sh2 - 55 to 60F is enough. That makes it the safest choice for an early planting and the most forgiving in a cold spring.
Isolate from other types
If su is pollinated by sh2, or vice versa, the kernels turn starchy and tough. Separate types by at least 250 feet, or by two weeks of planting date so they tassel at different times. Popcorn and field corn must also be kept away.
Block planting, not rows
Corn is wind-pollinated. Each silk that catches no pollen is a missing kernel, which is what a gap-toothed ear means. Plant at least four short rows in a block rather than one long row.
Heavy nitrogen feeder
Work in plenty of compost and side-dress with nitrogen at knee height and again at tasselling. Pale yellowing lower leaves mean it is hungry.
Water at tasselling
An inch and a half a week, and most critically from tasselling through kernel fill. Drought at that point directly costs kernels and cannot be made up.
Pests
Corn earworm enters through the fresh silk - a few drops of mineral oil on the silk as it browns suppresses it well. Raccoons will clear a patch the night before you pick; electric fencing is the only reliable answer.
Harvest
About three weeks after silks appear, when they are brown and dry and the ear feels blunt and full. Puncture a kernel with a thumbnail: milky is ready, clear is early, doughy is late. Pick in the cool of the morning and cook or blanch and freeze the same day.
- Type
- su - sugary
- Days to harvest
- 65-90
- Soil temp
- 55-60F
- Block
- 4+ rows
- Spacing
- 10-12 in
- Isolate from
- se and sh2
- Holds
- Hours
- Vigour
- Best germination of the three