Firminio's Plum Tomato is a semi-determinate heirloom variety with deep roots in Italian-American gardening history. Grown in a Middletown, NY garden by Italian immigrant Firminio Amitrano, these seeds were preserved and shared by his granddaughter Marilyn after his passing in 1980, making this a living family legacy. The plants reach 42 inches tall with a 24-inch spread, producing a reliable harvest in just 75 days. This variety thrives in full sun with moderate water and moderate soil pH, delivering the authentic plum tomato character that made Firminio's garden memorable.
Full Sun
Moderate
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42in H x 24in W
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High
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There's something deeply moving about growing a tomato that carries a family's immigration story in its seed coat. Firminio Amitrano brought these seeds from Italy, nurtured them in his New York garden, and his granddaughter Marilyn has kept them alive ever since, sharing them so others can grow what he grew. As a semi-determinate variety, it produces its harvest in a concentrated window, making it excellent for preserving or saucing. The 75-day timeline means you can plan your kitchen projects around a predictable, abundant yield rather than a trickle of fruit across months.
Plum tomatoes like Firminio's are the cook's choice for saucing, canning, and paste-making. Their dense flesh and lower seed and water content make them far superior to slicing tomatoes for reductions, preserves, and long-cooked sauces. These tomatoes excel when processed into marinara, passata, or dried for concentrated flavor. They're equally at home in rustic Italian cooking, where they might be crushed into a simple tomato sauce or preserved whole. Fresh, they're firm enough to hold their shape in cooking, making them reliable for roasting or long braises.
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Sow seeds indoors 6 to 8 weeks before your last spring frost date. Keep soil temperature between 68 and 82 degrees Fahrenheit for reliable germination. Use a seed-starting mix and keep consistently moist but not waterlogged. Seedlings will emerge in 5 to 10 days under ideal conditions.
Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days before planting. Transplant outdoors only after all frost danger has passed and soil has warmed to at least 60 degrees Fahrenheit, ideally 65 degrees or warmer. Space plants 24 inches apart with rows 42 inches apart. Plant slightly deeper than they grew in their containers, burying the lower stem to encourage a stronger root system.
Firminio's Plum Tomato reaches harvest readiness in approximately 75 days from transplanting. Pick fruit when fully colored and slightly soft to the touch but still firm; plum tomatoes should yield gently to pressure but not feel mushy. You can harvest at the mature green or fully colored stage depending on your plans. For processing or sauce-making, wait for peak ripeness when flavor is concentrated. Tomatoes picked at mature green stage will continue to ripen off the vine in a warm spot indoors.
As a semi-determinate variety, Firminio's naturally limits its growth and doesn't require aggressive pruning. However, you can remove lower leaves once plants are established to improve air circulation and reduce soil-borne disease pressure. Remove any damaged, diseased, or yellowing foliage as the season progresses. Some gardeners lightly prune side shoots to direct energy toward fruit ripening, particularly if your growing season is short, but this is optional.
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“Firminio Amitrano, an Italian immigrant, cultivated this plum tomato variety in his garden in Middletown, New York. The exact origin of the seeds remains a mystery, though family tradition holds that they arrived with Firminio in shipments of olive oil and other goods sent from Italy by relatives. After Firminio's death in 1980, his granddaughter Marilyn took on the role of seed steward, continuing to propagate the variety and eventually sharing the seeds with Hudson Valley Seed so that others could grow what her grandfather had treasured. It's a story of immigration, continuity, and the quiet power of home gardeners to preserve living history.”