25 seeds. 80 days. Solanum lycopersicum. Indeterminate. 
 
Tomato 'Thessaloniki' has sweet, red fruits that weigh about 5 ounces. It is productive and good for canning as the fruits are firm. This 1957 open-pollinated variety was bred in Greece.
 
Sowing Tomato Seeds: 
 
Start seeds indoors 6 to 8 weeks before the last frost date, 1/8 inch deep. Transplant outside 2 weeks after the last frost date. Plant tomatoes deep in the soil for a better root structure. Space 3 feet apart. Full sun.
 
Photo courtesy of Diane's Flower Seed