Gary O'Sena Tomato

Gary O'Sena Tomato

Individual Plant
$6.00
Skip to product information
Gary O'Sena Tomato

Gary O'Sena Tomato

$6.00
Pack Size

Larger than many "blacks" (up to 1 lb.), this is also one of the best according to many who have tried it. Flavor is excellent: bright, rich and compelling, potato leaf, indeterminate vines are fairly productive. A stabilized cross between Cherokee Purple and Brandywine & better than either in every regard. These tomatoes are perfect for slicing thick on sandwiches and burgers, chopping into fresh salads and salsas, or using in sauces and stews. This variety is a good choice for Utah because it is vigorous, heat-tolerant, and reliably productive in our hot, dry summers and shorter high-elevation season when given full sun and consistent moisture.

Days to Maturity: Approximately 75-85 days from transplant to first harvest (often 80 days typical; continues producing over an extended period).

Sun Needs: Full sun with at least 6-8 hours of direct sunlight daily—essential for good fruit size, rich flavor, and steady production in Utah’s intense summer light.

Season Type: Warm-season crop; frost-sensitive—transplant only after soil warms to 65°F+ and all frost danger has passed (late May to early June in the Salt Lake City area).

Plant Habit & Support: Indeterminate vining plants grow 6-9 feet tall; strong staking, caging, or trellising is essential to support heavy fruit loads, keep plants upright, and improve airflow—prune to 2-3 main stems for better manageability. Space 24-36 inches apart.

Other Notes: Good disease resistance and heat tolerance; watch for blossom-end rot from inconsistent watering—organic mulch (like straw or compost) helps retain steady moisture and reduce soil splash; very productive with large, attractive fruits.

Best Planting Method: Transplant when nights stay above 55°F and soil is warm. Space plants 24-36 inches apart in rows or beds; bury stems deeply (up to the first set of true leaves) to encourage strong roots. Amend soil with compost for fertility and excellent drainage—raised beds are ideal in heavier or alkaline Utah soils to improve root health and prevent issues. Organic mulch (such as straw, compost, or grass clippings) around plants conserves moisture, suppresses weeds, and moderates soil temperature.

Watering Needs: Provide consistent, deep watering (1-2 inches per week) to keep soil evenly moist, especially during flowering and fruit development—drip irrigation is ideal in dry Utah air to keep foliage dry and minimize disease. Avoid fluctuations that cause cracking or blossom-end rot; mulch helps maintain steady moisture, and containers may need more frequent checks during hot spells.

Fertilization Needs: Incorporate compost or balanced slow-release fertilizer (e.g., 10-10-10) at planting. Side-dress with a higher-phosphorus/potassium formula (like 5-10-10) when flowering begins to support fruit production over excess foliage. Tomatoes are heavy feeders—avoid high nitrogen late in the season to prevent leafy growth at the expense of fruit; organic options like compost tea provide steady nutrients. Harvest when fruits are fully red and firm—pick regularly to encourage continued production and enjoy peak sweetness.

Recommended companion plants

You may also like