Tender Plant between average date of last spring frost (about when first apples bloom) and July 1.
Acidity (pH) Tolerance
5.5 - 7.5 pH
Salinity (Ec) Tolerance
Band 1.5 lbs. all-purpose fertilizer (20-20-20) per 100 feet row at time of planting. Side dress fertilizer when plants are about 8" high with .25 cup of 34-0-0 for every 10 ft. of row.
Corn needs a steady, ample water supply during the growing season. Increase watering during silking and kernel growth.
Plant Development and Care
Scientifically, sweet corn is Zea mays regosa. The genus Zea, is Greek for some cereals, the species mays, a different spelling for maize, which means corn, and the variety regosa, means wrinkled and refers to the mature seed. Sweet corn (su) converts kernel sugar to starch immediately after harvest. This means the sweet flavor is lost rapidly.
Supersweet types were discovered in 1950. They contain more sugar and when dried, the kernels shrunk thus the name "shrunken two" (sh2). These high sugar types are Supersweet because the sugar level can be twice as great as normal sugary (su) sweet corn at maturity. The supersweet types converts sugar to starch slower so the sweet flavor lasts longer after harvest.
Ten years later a new genetic corn tupe type, sugary enhanced (se) was introduced. The (se) corn has higher sugar levels so the sweet flavor lasts longer after harvest. These (se) sugary enhanced types are very popular because they combine sweet flavor with easy growing needs.
Supersweet (sh2) types are excellent eating, but must be isolated from normal sugary and sugary enhanced sweet corn.
The easiest ways to isolate varieties are to grow only one variety of sh2 sweet corn or grow varieties with maturity dates at least 10 to 14 days apart from the supersweet, so they will not release pollen simultaneously.
For optimum growth and production, keep the patch weeded. Hoe or pull weeds until the stalks stand 12 to 15 inches tall. Avoid damaging the shallow root moisture and control weeds.
Sweet corn is a heavy feeder and quickly depletes soil nutrients. Use a complete fertilizer at planting and add nitrogen fertilizer when stalks are eight inches tall and when the tassels appear.
Sow short, mid, and long-season varieties at one time to stagger the harvest or plant varieties with similar season lengths at 2 week intervals.
Supersweet (sh2) types provide excellent eating, but must be isolated from normal sugary and sugary enhanced sweet corn. The easiest ways to isolate varieties are to grow only one variety of sh2 sweet corn or to grow varieties with maturity dates at least 10 -14 days different than the supersweet, so they will not release pollen simultaneously.
Germination Time (Days)
Soil Temperatures/Days 58° to 65° F: 7 to 12 days 50° F: 22 days 59° F: 12 days 68° F: 7 days 77° F to 86° F: 4 days 95° F: 3 days
Seed Germination and Temperature Range
Air Temp: 70-75° F daytime and 60° to 65° nighttime. Soil temperatures for sweet corn: 58-68° F Soil temperatures for super-sweet corns: 77-95° F.