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Grandeur is a Japanese hybrid tomato that combines vigor with reliability, producing uniform, deep-red fruits with distinctive green shoulders over 70 days from transplant. This indeterminate variety reaches 4 to 5 feet tall and yields large, firm slicing tomatoes that weigh over half a pound each. Built with strong resistance to multiple soil and foliar diseases, Grandeur thrives in garden beds, raised beds, and greenhouses, making it a dependable choice for gardeners seeking both productivity and disease peace of mind.
Full Sun
Moderate
2-11
60in H x ?in W
—
High
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Large, uniform fruits with deep red color and green shoulders distinguish Grandeur from typical red slicers. This Japanese hybrid brings vigorous growth and reliable production to any garden, backed by resistance to ten major tomato diseases including Fusarium Wilt, Tobacco Mosaic Virus, and Gray Leaf Spot. The firm texture and substantial size make it a workhorse for fresh slicing and cooking alike.
Grandeur excels as a slicing tomato for fresh use, sandwiches, and salads, where its firm texture and large size shine. The deep-red color and substantial weight make it equally capable in cooking applications, sauces, and any preparation where a meaty, structured tomato holds up well.
No timeline data available yet for this variety.
Start seeds indoors in a warm environment maintaining soil temperatures between 68 and 82°F. Sow seeds at the appropriate depth and keep soil consistently moist. Transplant seedlings into larger containers as they develop true leaves, continuing to provide warmth and bright light.
Transplant outdoors after all frost danger has passed and soil has warmed. Space plants 18 inches apart in rows 36 inches apart. Harden off seedlings gradually by exposing them to outdoor conditions over 7 to 10 days before final planting to reduce transplant shock.
Harvest Grandeur tomatoes 70 to 79 days after transplanting when they reach full deep-red color, typically picking fruits when they have fully colored but still feel slightly firm to the touch. Look for fruits that yield gently to pressure but haven't become overly soft. Pick tomatoes in the morning when temperatures are cool, and continue harvesting regularly to encourage ongoing production throughout the season.
As an indeterminate variety, Grandeur benefits from pruning suckers and lower leaves as the plant grows. Remove suckers (shoots that form between the main stem and branches) to direct energy into fruit production and improve air circulation around the lower canopy. Prune off the lowest leaves once the plant is established to keep fruit away from soil and reduce disease pressure.
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“Grandeur is a Japanese-bred F1 hybrid developed to combine the disease resistance demands of modern gardening with the productivity needs of both home and commercial growers. The variety represents Japan's horticultural expertise in creating stable, vigorous hybrid tomatoes adapted to diverse growing conditions around the world.”