Big Rainbow

Tomato

90d to harvest

Sink your senses into Big Rainbow’s richly layered, sun-warmed beauty—its flesh tastes like a bright, juicy tapestry with sweet, tangy depth and a distinctly beefsteak, meaty bite. Expect a substantial, irregularly lobed fruit with a tender, succulent texture that shines in bold slices and hearty centerpiece salads, and holds its own for vibrant sauces and slow-simmered preserves. For home gardeners, Big Rainbow delivers show-stopping color and a satisfying, garden-to-plate presence from the first blush of ripening through the final harvest.

Crop Dates

Growing note: Frost-free Zone 10a supports continuous outdoor production.

Milestone	Date
Climate	Frost-Free Climate
Growing Approach	Continuous Production

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Determinate
Support Needed	Cage
Planting Depth	Deep
Germination Temp (°F)	80
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	10

Frequently Asked Questions

How do I manage aphids and leaf curling on Big Rainbow during warm weather?

Check the underside of leaves and new growth at least twice a week; clusters of soft-bodied aphids and distorted, curled leaves are the giveaway. Spray plants with a strong jet of water, then apply insecticidal soap (especially undersides) and repeat every 5–7 days until you stop seeing new colonies. Avoid heavy nitrogen feeding during outbreaks because it encourages more tender growth for aphids.

How often should I water Big Rainbow during peak growth to keep the right soil moisture?

During the main 6–8 weeks of growth, water deeply about 1–2 times per week so the top 2–3 inches of soil stay evenly moist but never soggy. If the soil feels dry 1 inch down, water until excess drains; if it’s still wet or cool, wait—Big Rainbow dislikes waterlogged roots. Use mulch to reduce evaporation and keep moisture consistent, which helps prevent stress-related leaf issues.

When is Big Rainbow ready to harvest, and how can I tell?

Harvest at about 90 days from sowing when the plants’ heads/fruit have reached full color and the surface looks firm and fully developed (no pale, under-sized areas). For the most reliable timing, do a test harvest of one plant: it should feel filled out and hold shape after picking. If you see fading color or softening, pick promptly to avoid quality decline.