Heirloom Siberian Tomato Early Op 50 Seeds Set Fruit At 38&deg;f (3.33&deg;c) HEIRLOOM SIBERIAN TOMATO -- 50 SEEDS Lycopersicon esculentum 48 days. Plant produces good yields of flavorful 5 oz (142g) bright red tomatoes. Plant is capable of setting fruit even at 38 degrees F (3.33C). One of the earliest varieties on the market, takes only 7 weeks when transplanted outdoors. A popular variety grown in Alaska. A heirloom variety from Russia. Determinate. SEED SOWING: Plant seeds when the soil is warm after danger of all frost. Soil germination temperature 70F-85F. Sow seeds 1/4" deep in fine well-drained soil. Germination is 7-14 days depending upon growing conditions. Thin seedlings to 24" apart.