How to Grow Flash Series Tomato Flash Hybrid

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Flash Series Tomato Flash Hybrid

Solanum lycopersicum 'Flash'

vegetable

Flash is a determinate hybrid tomato cultivar bred for early maturity and disease resistance, producing medium-sized red fruits ideal for fresh market and home gardens. Known for setting fruit quickly even in cooler conditions, it's particularly valued in short-season growing regions. The compact plant habit makes it suitable for containers and small spaces.

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Example Flash Series Tomato Flash Hybrid timeline · Pittsburgh, PA (Zone 6b)

Plant Flash Series Tomato Flash Hybrid
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Flash Series Tomato Flash Hybrid
Around Jun 11

≈ 55 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Flash Series Tomato Flash Hybrid dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun, minimum 6-8 hours daily (8+ hours preferred for maximum fruit production)

💧

Water: Consistent moisture of 1-1.5 inches per week; maintain even soil moisture to prevent cracking and disease; water at soil level to keep foliage dry and reduce disease pressure

📏

Spacing: 24 inches

📅

Days to maturity: 55-65 days from transplant

🌱

Planting depth: Bury stem deeply (up to first true leaves) to encourage root development; start seeds 0.25 inches deep

Soil

Type: Well-draining loamy soil, rich in organic matter

pH: 6.0-6.8

Amendments:

Compost or aged manure Balanced fertilizer (5-10-10) Calcium (gypsum or lime) to prevent blossom end rot Peat moss or coco coir for moisture retention

Growing Zones

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Thrives in zones 3-10; exceptional performance in short-season zones 3-6

2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b

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Growth Stages

Seedling

3-4 weeks

Tiny plants with cotyledons and first true leaves emerging; fragile and pale green

Maintain soil moisture without waterlogging; provide 14-16 hours of bright light daily; keep temperature 70-75°F; begin dilute fertilization after true leaves appear

Vegetative

4-6 weeks

Bushy, compact growth with multiple branches; leaves are dark green and fully formed; no flowers yet

Continue regular watering and feeding with balanced fertilizer; harden off seedlings before transplanting; consider pruning only lower branches once in-ground; plant deeply to bury stem

Flowering

2-3 weeks

First flower clusters (inflorescences) appear in leaf axils; yellow flowers in groups of 3-5; plant continues growing

Maintain consistent watering to prevent flower/fruit drop; switch to lower-nitrogen fertilizer (5-10-10) to encourage fruiting; ensure adequate calcium intake; maintain air circulation

Fruiting & Ripening

3-4 weeks

Small green fruits develop rapidly; fruits swell and gradually change from green to red; determinate type stops growing taller

Water deeply and consistently; provide stake/cage support for fruit weight; apply mulch to regulate soil temperature and moisture; continue balanced fertilization; remove yellowed lower leaves for air flow

Harvest

2-3 weeks (concentrated harvest period)

Fruits fully red and mature; plant has finished main growth; fruits ripen continuously on compact plant

Harvest ripe fruits regularly to encourage continued production; pick fruits at full color for best flavor; determine variety matures all fruits within narrow window typical of determinate types

Companion Planting

Plan your garden →

Plant with:

Basil Marigold Parsley Carrot Onion Borage Nasturtium Chives

Avoid planting near:

Brassicas (cabbage, broccoli, cauliflower) Fennel Dill Corn Nightshades (pepper, eggplant) in same location if disease present

Common Pests

Hand-pick regularly; use Bacillus thuringiensis (Bt); encourage parasitic wasps; neem oil spray
Strong water spray; insecticidal soap; neem oil; introduce ladybugs or lacewings
Yellow sticky traps; neem oil; insecticidal soap; reflective mulch; vacuum pests off leaves
Increase humidity; strong water spray; miticide; sulfur dust; predatory mites
Remove infected leaves; improve air circulation; mulch to prevent soil splash; copper or sulfur fungicide
Remove lower leaves; stake and prune for air flow; copper fungicide; drip irrigation at soil level

Uses

🍳

Fresh eating and slicing

Culinary

Medium-sized fruits (4-6 oz) are perfect for sandwiches, salads, and fresh consumption. The firm texture and good flavor make Flash an excellent choice for fresh market sales and home table use. [source]

🍳

Sauce and processing

Culinary

The determinate harvest pattern concentrates ripening, making Flash ideal for sauce, paste, and canning projects. High solids content produces good-quality processed products. [source]

🍳

Container gardening

Culinary

Compact determinate growth fits perfectly in containers (5-gallon minimum), hanging baskets, and patio gardens. Productive despite limited root space. [source]

💊

Heart health and antioxidants

Medicinal

Tomatoes are rich in lycopene, a powerful antioxidant linked to cardiovascular health and reduced cancer risk. The bright red color indicates high lycopene content. [source]

🦋

Pollinator support

Wildlife

Yellow tomato flowers attract bees and other pollinators to the garden. While determinate types flower briefly, they still provide valuable nectar and pollen sources during their bloom period. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest fruits when fully red and slightly soft to touch, typically 55-65 days after transplanting. For Flash hybrids, the determinate growth habit means most fruit ripens within a 2-3 week window, ideal for canning or bulk harvesting. Pick fruits in the morning for best flavor. Ripe fruits should come off the vine with gentle twisting. For shelf storage, pick at breaker stage (first blush of color) and allow to ripen on counter. Determinate types typically produce heavy initial crop followed by lesser yields.

Fun Facts

🌱 Flash is an early maturity hybrid bred specifically to succeed in short-season climates; it can produce ripe fruit in as few as 55 days from transplant, allowing northern gardeners to enjoy homegrown tomatoes before first frost
🌱 The determinate (bush) growth habit means the plant produces most of its flowers and fruit on a concentrated timeline, then slows production—this is actually a feature for commercial growers and people wanting bulk harvest for canning
🌱 Flash hybrids have built-in disease resistance (often VF or VFNT on the seed packet), meaning they resist Verticillium wilt, Fusarium wilt, and sometimes nematodes—reducing the need for fungicide sprays compared to heirloom varieties

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Full Sun Hybrid Mulch Transplant True Leaves

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