Indigo Rose Tomato

Indigo Rose is a striking open-pollinated tomato developed at Oregon State University and known for its unusual deep purple to nearly black skin. The small, round fruits typically weigh about 1–2 oz (28–57 g) and develop their darkest colour on areas exposed to direct sunlight. As the fruit ripens, the underside develops a rosy-red colour while the flesh remains deep red.

The fruits have a good balance of sweetness and acidity, with a mild, pleasantly tangy tomato flavour. Indigo Rose is also notable for its naturally high anthocyanin content, the pigment responsible for its distinctive purple colour. For the best flavour, allow the fruits to ripen fully until the purple skin becomes duller and the underside develops its mature red colour.

Type: Saladette / cocktail, open-pollinated
Fruit: 1–2 oz, round; deep purple to nearly black with rosy-red underside
Flavour: Mild, balanced, sweet and tangy
Flesh: Deep red, firm and juicy
Uses: Fresh eating, salads, snacking and garnishing
Growth Habit: Indeterminate, regular leaf
Maturity: Approximately 80–90 days from transplant
Light: Full Sun
Germination: 5–10 days
Ideal Germination Temperature: 23–29°C (73–84°F)
Seed Depth: 1/8–1/4 inch (3–6 mm)
Plant Spacing: 24–36 inches (60–90 cm)
Frost Hardiness: Not frost hardy
Botanical Name: Solanum lycopersicum
Pollination: Open-pollinated

Starting & Growing Tips

Start seeds indoors approximately 6–8 weeks before the last spring frost. Sow 1/8–1/4 inch deep and keep the growing medium warm and evenly moist. A heat mat can help maintain the warm soil temperatures tomatoes need for reliable germination.

Transplant outdoors only after the danger of frost has passed and the soil has warmed. Choose a location with full sun and fertile, well-draining soil. Because Indigo Rose is indeterminate, provide a sturdy cage, trellis, or stake for support. Good sun exposure is particularly important because the characteristic purple anthocyanin pigmentation develops where the fruit receives direct sunlight.

For the best flavour, allow the fruit to fully ripen on the plant. The purple skin will become less shiny and more dull purple-brown, while the unexposed underside develops a rosy-red colour. The fruit should also soften slightly when ripe.

Minimum Seed Count: 25 seeds