Rainbow Corn

Corn

75d to harvest

Sunlit kernels in a living spectrum—creamy gold, rosy blush, and cool blue-green—glow along each Rainbow Corn ear with a satin sheen that feels almost too beautiful to touch. At maturity, the cobs are medium to long with tightly packed rows, offering a tender, sweet corn flavor that shines in fresh displays and becomes especially memorable when roasted or grilled for caramelized depth. Grow it for show-stopping color in the garden and for versatile use in salads, salsas, and vibrant pickling projects—each harvest a small bouquet of edible color.

Crop Dates

Growing note: In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

Milestone	Date
Start Indoors	—
Climate	Frost-Free Climate
Transplant / Sow Outdoors	Oct 1st
Harvest Begins	Dec 15th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	60
Min Soil Temp (°F)	55
Min Night Temp (°F)	50
Harden Off (days)	Not Required

Frequently Asked Questions

What pests or diseases commonly hit sweet corn (Zea mays var. saccharata), and what can I do right away?

Corn earworm and fall armyworm are common and usually show up as holes in ear tips with frass. Check ears every 2–3 days once silks emerge and remove heavily infested ears early; for protection, use a Bt corn spray when silks are actively growing (follow the label) and keep weeds down around the bed. Watch for fungal leaf blights and rust; if you see spreading leaf spotting, improve airflow by thinning to the recommended spacing and avoid overhead watering.

How often should I water rainbow sweet corn during the main growing phase (tasseling to ear fill)?

From about tassel emergence through ear fill, keep soil consistently moist—typically 1–1.5 inches (2.5–3.8 cm) per week, split into 2–3 waterings to prevent drying between. Water deeply so moisture reaches the rooting zone, and stop light “sprinkling” that only wets the surface. If soil dries enough for leaves to wilt in the afternoon, water immediately to protect ear development.

How can I tell when rainbow sweet corn is ready to harvest?

Harvest when silks turn brown and dry, and kernels release a milky juice when you press them—this is the best sweet-corn indicator. Each ear is usually ready about 18–22 days after the first silks appear, but check the earliest-developed ears first. For peak sweetness, plan to harvest the same day you’ll eat or refrigerate immediately after picking.