Corn grows well with cucumbers, but for some reason the cucumbers fall victim to powdery mildew easier. The old Mexican companion planting method of corn and pumpkins suppresses weeds. The combination confuses pests. Cotton and sesame grow commercially with corn to attract predators to control budworm pest. Peanuts and corn increase the number of spiders.
Corn are hungry feeders loving plenty of mulch and liquid manure.
Feed weekly until the tassels appear and then stop. Corn seed stores easily. Leave until the sheath around the cob dries and the ears are hard and a rich yellow. Cover with paper bags to avoid this problem. Harvest corn when the tassels die and the cobs stands out from the stem at 30 degrees.