Hawaiian Rainbow

Family: Poaceae Grain Vegetable

Feel the first silk-bright glow as the ears emerge—Hawaiian Rainbow corn develops striking, multicolored kernels that shimmer like stained glass in the garden.

The kernels are firm and pleasantly crisp, with a vivid spectrum that makes each ear a living centerpiece. Grow it for ornamental impact in beds and borders, and for show-stopping displays of color that shine at harvest and beyond.

Light: Full SunMaturity: 75 DaysHabit: Upright

Botanical illustration of Hawaiian Rainbow

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jul 9th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	55
Min Night Temp (°F)	28
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

Even though it’s grown for its stained-glass look, the kernels still taste like real sweet corn—crisp, juicy, and clean. Grill or quick-sauté it and keep the heat brief; this variety’s texture stays snappy instead of going pasty.

Best Uses

serve as street-corn style grilled skewers (charred outside, crisp inside)
quick blanch-and-sauté in butter with a squeeze of lime
use shaved kernels in cold salads for a crunchy, color-holding texture
steam and slice off the cob for tacos or grain bowls

Flavor Profile

sweet, corn-forward freshness snappy, juicy kernel bite lightly starchy, clean finish

Kitchen Pairings

lime smoked paprika chile-lime crema butter cotija cheese

Frequently Asked Questions

What pest or disease problem is most common on sweet corn (Zea mays var. saccharata) and how do I treat it?

Corn earworm and fall armyworm are common on sweet corn, with larvae boring into developing ears. Inspect weekly once silks appear, then apply a labeled Bt product (Bacillus thuringiensis) aimed at corn caterpillars as soon as you see fresh feeding or early frass. If you notice smut galls (black, swollen kernels) on ears, remove and discard the affected parts promptly to reduce spread to nearby plants.

How often should I water sweet corn during the main growing phase (after tassel and ear formation)?

During tassel-to-ear-filling, keep the soil consistently moist but not waterlogged, aiming for about 1 to 1.5 inches of water per week depending on heat and rainfall. Water deeply 1–2 times per week so the moisture reaches deeper roots; shallow daily watering often leaves corn drought-stressed at ear depth. Mulch lightly around plants to reduce surface drying, and increase watering if leaves start to fold or turn dull-gray.

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

Harvest about 20–25 days after the silks first emerge and when the tassels have begun to dry. Kernels should feel plump and release a milky, whitish liquid when pressed with a fingernail; if the liquid is watery or clear, leave it a few more days. Pick in the morning for the sweetest flavor, and harvest every day or two as ears ripen quickly.