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Tomato Seeds, Brad's Atomic Grape
Description
(Solanum lycopersicum). Our favorite tomato! Large, elongated cherries in clusters. The color (and flavor!) is a full-blown assault on the senses—lavender and purple stripes that turn to Technicolor olive-green, red, and brown/blue stripes when fully ripe. Really wild! Fruit holds well on the vine or off, making this amazing variety a good candidate for market growers. Crack-resistant fruit is extraordinarily sweet! Wispy foliage looks delicate but belies these plants’ rugged constitution and high productivity. These range some in size from a large grape to plum-sized.
- Indeterminate
- 75 days to maturity
- 6-8 hours of full sun
- Sprouts in 7-14 days
- Seed Depth: 1/8"
- Plant Spacing: 24"
- Ideal Temperature: 75-95 F
- Frost Hardy: No
Growing Tips, Tricks and FAQs
Growing Tips
Brad's Atomic grape is an indeterminate tomato variety that requires full sun and well-draining, nutrient-rich soil. In colder climates, consider using a heat map to help warm the soil and speed up germination.
When to Grow
Start seeds indoors 6-10 weeks before the last expected frost. Transplant outdoors once the frost risk has passed and nighttime temperatures don’t drop below 50 F. In cooler climates, consider starting earlier or using row covers to extend the season.
How to Sow and Plant
Sow seeds 1/8 inch deep in seed-starting mix. Keep the soil warm, at least 75 F F, for optimal germination. When transplanting, space plants about 24 inches apart to accommodate their vigorous growth. Staking or caging is recommended to support the vines and prevent sprawling​.
How to Grow
Brad's Atomic grape tomatoes need consistent watering, aiming to keep the soil evenly moist but not waterlogged. Apply a balanced fertilizer every 2-3 weeks to support growth. Pruning helps manage the plant’s size and increases airflow, which can reduce disease risk. Harvest the fruits when they have turned a deep purple or red and feel slightly soft to the touch​.
How to Save
- Most tomatoes are self-pollinating and don't frequently cross; in a garden setting, separating by 25 feet should prevent 99% of cross-pollination. Or you can bag and hand pollinate for 100% purity.
- On a small scale, seeds may be scooped from the fruits and dried on a paper towel.
- For larger quantities or cleaner seeds, fermentation for a few days is recommended.
- Once dry, tomato seed can be stored in a cool, dry, dark place; good seed retains viability for 5 years or more.
FAQ
How can I know when Brad’s Atomic grape tomatoes are ripe?
The fruits are ready to harvest when they display deep purple or red hues and yield slightly when gently squeezed​.
Are Brad’s Atomic grape tomatoes suitable for containers?
Yes, they can be grown in containers with a minimum size of 5 gallons, provided they have adequate support, due to their vining nature​.
What are common pests and diseases for Brad’s Atomic grape tomatoes?
This variety can be affected by pests like aphids and tomato hornworms. Common diseases include early blight and fusarium wilt, which can be managed with good sanitation practices and crop rotation.
More Questions?
Check out our "Tomatoes 101" blog post by staff horticulturist John Lenz.
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