Two whole Big Rainbow tomatoes and one cut in half to show the center on a white background.
Big Rainbow Tomatoes stacked on one another on a white background.
Cut and whole Big Rainbow Tomatoes on a soil background shot in the fields.
A close-up of a giant juicy slice of a Big Rainbow Tomato with more tomatoes in the background.
Big Rainbow Tomatoes on a red plate with a vintage Sunset magazine and salt shaker.
A farmer holding a Big Rainbow Tomato in the greenhouse at Baker Creek.
Two whole Big Rainbow tomatoes and one cut in half to show the center on a white background.
Big Rainbow Tomatoes stacked on one another on a white background.
Cut and whole Big Rainbow Tomatoes on a soil background shot in the fields.
A close-up of a giant juicy slice of a Big Rainbow Tomato with more tomatoes in the background.
Big Rainbow Tomatoes on a red plate with a vintage Sunset magazine and salt shaker.
A farmer holding a Big Rainbow Tomato in the greenhouse at Baker Creek.

Tomato Seeds,
Big Rainbow

4.232 ReviewsSKU: #TS101Min. seed count: 25
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Description

(Solanum lycopersicum). Huge fruit up to 2 lbs; delicious and sweet tasting. These tomatoes are very striking sliced, as the yellow fruit has neon red streaking though the flesh. An heirloom preserved by members of Seed Savers Exchange.

Growing Tips: Big Rainbow tomatoes grow best in full sun and nutrient-rich, well-draining soil. Use support such as cages or stakes to manage the plant's height and the weight of the large fruits. Regular pruning of suckers can help direct the plant's energy toward fruit production.

Plant Details

Botanical Name
Solanum lycopersicum
Life Cycle
Annual
Growth Habit
Indeterminate
Sun Requirement
6–8 hr.
Days to Germinate
7–14
Days to Maturity
85
Planting Depth
⅛ in.
Plant Spacing
24 in.
Ideal Temperature
75–95°F
Frost Hardy
No

When to Grow

Start seeds indoors 6-10 weeks before the last expected frost date. Transplant seedlings outdoors after the danger of frost has passed and temperatures stay above 60 F. Check local frost date calendars to determine optimal planting times for your specific region or hardiness zone. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow seeds 1/8 inch deep in quality seed-starting mix, keeping the soil temperature between 70-80 F during germination. You can also use a heat mat to help keep the soil warm. Harden off seedlings by gradually exposing them to outdoor conditions over 7-10 days before transplanting them into the garden. Space plants about 24 inches apart.

How to Grow

Water consistently, keeping the soil evenly moist but not waterlogged. Fertilize with a balanced fertilizer or one formulated for tomatoes every 2-3 weeks during the growing season. Prune by removing suckers to direct energy toward fruit production and improve air circulation. Regularly monitor for pests and diseases.

How to Save Seeds

  • Most tomatoes are self-pollinating and don't frequently cross; in a garden setting, separating by 25 feet should prevent 99% of cross-pollination. Or you can bag and hand pollinate for 100% purity.
  • On a small scale, seeds may be scooped from the fruits and dried on a paper towel.
  • For larger quantities or cleaner seeds, fermentation for a few days is recommended.
  • Once dry, tomato seed can be stored in a cool, dry, dark place; good seed retains viability for 5 years or more.

FAQ

What makes Big Rainbow tomatoes different from other varieties?

Their large size, bi-colored appearance, and sweet, mild flavor distinguish them.

How long does it take for Big Rainbow tomatoes to mature?

Under ideal conditions, they are ready to harvest about 85 days from transplanting. The plants will continue providing a steady harvest throughout the season.

Do Big Rainbow tomatoes need support?

Yes, because of their indeterminate growth habit and large fruit size, support such as staking or caging is recommended.

Browse our full range of heirloom tomato seeds.
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