SproutSmart
SproutSmart™ Intelligent Garden Sowing

Hawaiian Rainbow

Corn
Zone 1a Save Garden

Planting Schedule

Add Hawaiian Rainbow to your garden to build a schedule and get reminders.
Botanical illustration of Hawaiian Rainbow
75d to harvest

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.

Crop Dates

Growing note: Zone 1a has only 30 frost-free days — shorter than this crop's 75-day maturity. Outdoor planting is not viable; use protected cultivation.
MilestoneDate
Last FrostJun 15th
Growing ApproachProtected Environment Only

Crop Details

TraitValue
Days to Maturity75
Sun RequirementsFull SunFull sun
Growth HabitUpright
Support NeededNone
Planting DepthNormal
Germination Temp (°F)55
Min Soil Temp (°F)55
Min Night Temp (°F)28
Harden Off (days)Not Required

Today's Conditions

Outdoor planting for Hawaiian Rainbow in Zone 1a typically begins around Indoor Lights Only. Wait until soil reaches at least 55°F before transplanting Hawaiian Rainbow.

Garden Alerts

Zone 1a has only 30 frost-free days — shorter than this crop's 75-day maturity. Outdoor planting is not viable; use protected cultivation.

Recommended Companions

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Taishan Yellow Marigold
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Sunflower Sunflower
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Sweet Success Cucumber
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Soraya Sunflower
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Inca II Marigold
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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 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.
Botanical illustration of Hawaiian Rainbow

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.

Today's Conditions

Outdoor planting for Hawaiian Rainbow in Zone 1a typically begins around Indoor Lights Only. Wait until soil reaches at least 55°F before transplanting Hawaiian Rainbow.

Garden Alerts

Zone 1a has only 30 frost-free days — shorter than this crop's 75-day maturity. Outdoor planting is not viable; use protected cultivation.

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 55°F for reliable germination and early growth.

Expert Note

Plant in blocks (not rows) for better pollination, and keep soil evenly moist during ear formation.