SOWING: Cold soil planting risks poor germination. Even treated corn seeds risk low germination under 60°F. Only treated seeds of good cold-germinating varieties may be sown in 55°F soil if warmer weather is anticipated. We recommend planting UNTREATED seeds when soil is warm, at least 65°F. Floating row covers may be used on early plantings to help moderate soil temperature. Each corn variety will state if it is TREATED or UNTREATED in the characteristics tab.
PLANTING: Keep Super Sweets corn varieties a minimum of 300 feet from non-Super Sweet varieties. Sow 3/4-1″ deep, 6-7″ apart (treated) & 4-5″ (untreated), rows 30-36″ apart. Arrange in blocks of at least 4 rows for proper pollination, which is needed for well-filled ears. Successive plantings can be made through early summer; most growers prefer to extend the sweet corn season by planting a few varieties of different maturities.
DAYS TO MATURITY: Varies widely with weather conditions and planting dates. Use these figures to compare one variety to another, not to accurately predict maturity on a given day. All corn varieties will have average maturity dates available. Also can be search by early, mid and late season harvest corn varieties.
HARVEST: When kernels are full and “milky,” generally indicated by a drying and browning of the ear silks. Record the date on which about half the plants show silk. Corn is ready to eat 18-24 days after ear silks first show; the warmer the weather, the sooner you can pick it.
AVG. SEEDING RATE: 1M/500′, 5M/2,500′, 25M/12,500′, 30M/acre at 2 seeds/ft. in rows 36″ apart.
SEED COUNTS: Average seed counts can be found on each variety corn variety page. On average a 1 ounce packet will sow a 75′ row at a seed sowed every 6″.