How to Grow Cascadia Deep Purple

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Cascadia Deep Purple

Solanum lycopersicum 'Cascadia Deep Purple'

vegetable

Cascadia Deep Purple is a determinate cherry tomato variety prized for its exceptionally dark, deep purple fruits with rich, complex flavor. The compact plants are well-suited to containers and small spaces while producing abundant yields throughout the season. This modern variety offers disease resistance and reliable productivity for home gardeners.

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Example Cascadia Deep Purple timeline · Pittsburgh, PA (Zone 6b)

Plant Cascadia Deep Purple
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest Cascadia Deep Purple
Around Jun 26

≈ 70 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Cascadia Deep Purple dates for your own zip code.

Growing Conditions

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Sun: Full sun, 8+ hours daily (10+ hours optimal for deep color development)

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Water: Consistent, deep watering 1-2 inches per week; maintain even soil moisture to prevent cracking and blossom end rot. Water at soil level, avoiding wetting foliage to reduce disease

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Spacing: 18 inches

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Days to maturity: 70-80 days from transplant

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Planting depth: 1/4 inch for seeds; bury transplant stem up to first true leaves

Soil

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

pH: 6.0-6.8

Amendments:

Compost Aged manure Perlite for drainage Calcium (crushed eggshells or gypsum to prevent blossom end rot)

Growing Zones

Find your zone →

Thrives in zones 5-10; can be grown as annual in zones 3-4 with season extension

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

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Growth Stages

Seedling

3-4 weeks

Tiny seedlings emerge with cotyledons (seed leaves); first true leaves appear within 1-2 weeks. Plants are delicate and pale green

Keep soil consistently moist but not waterlogged. Provide 14-16 hours of bright light daily (seedling lights 3-4 inches above). Maintain temperature 70-75°F

Vegetative Growth

3-4 weeks in containers/indoors; 2-3 weeks after field transplanting

Compact, bushy plant develops multiple stems and increasingly complex foliage. Deep green leaves with typical tomato morphology; no flowers yet

Gradually acclimate to outdoor conditions before transplanting. Space properly for air circulation. Apply balanced fertilizer every 2 weeks. No pruning needed for determinate varieties

Flowering

2-3 weeks

Small yellow flowers appear in clusters (inflorescences). Plant reaches mature height and width; dense foliage visible

Maintain consistent watering and calcium availability. Switch to higher-phosphorus fertilizer to support flower set. Provide full sun exposure for color development. Ensure pollination with gentle shaking or garden activity

Fruiting

3-4 weeks per flush; continuous production until frost

Tiny green fruits begin forming and rapidly enlarge. Fruits progress from light green to dark green with purple shoulders, finally reaching deep purple at full maturity

Continue consistent watering and calcium supplementation. Maintain full sun exposure—this is critical for achieving deep purple coloration. Fertilize every 2 weeks with lower nitrogen. Support branches with cages or stakes

Harvest

Ongoing until first frost (typically 8-12 weeks of harvest period)

Fruits reach deep purple color with slight softness indicating ripeness. Some varieties may show green shoulders even when ripe—this is normal for purple tomatoes

Harvest when fully colored and slightly soft to touch. Can pick slightly underripe and allow to finish indoors. Harvest regularly to encourage continued production. Handle gently to avoid bruising

Companion Planting

Plan your garden →

Plant with:

Basil Parsley Carrots Onions Marigolds Nasturtiums Borage Chives

Avoid planting near:

Fennel Dill Brassicas (cabbage, broccoli, brussels sprouts) Potatoes Corn

Common Pests

Handpick large caterpillars; encourage parasitic wasps; use Bacillus thuringiensis (Bt) spray for heavy infestations
Use yellow sticky traps; spray with insecticidal soap or neem oil; encourage natural predators like ladybugs
Remove infected leaves; ensure good air circulation; avoid overhead watering; apply copper fungicide if severe
Remove lower infected leaves; mulch to prevent soil splash; apply copper or chlorothalonil fungicide; maintain plant spacing
Increase humidity; spray with strong water stream; use miticide or insecticidal soap; encourage predatory mites
Spray with strong water; use insecticidal soap; apply neem oil; encourage natural predators

Uses

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Fresh eating and gourmet cooking

Culinary

Cascadia Deep Purple cherry tomatoes offer exceptional sweet-tart flavor with subtle smoky notes, ideal for fresh salads, charcuterie boards, and gourmet appetizers. Their striking color makes them visually stunning in any dish [source]

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Sauce and preservation

Culinary

The rich flavor and natural sugars make these tomatoes excellent for sauces, pastes, jams, and canning. Their dark pigmentation creates visually appealing preserved products [source]

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Antioxidant-rich nutrition

Medicinal

Deep purple tomatoes contain significantly higher levels of anthocyanins and lycopene compared to red varieties, offering enhanced antioxidant and anti-inflammatory benefits. Regular consumption supports heart health and cellular protection [source]

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Ornamental garden feature

Household

The deep purple fruits contrasting with green foliage create striking visual appeal in containers, raised beds, or landscape plantings. The compact determinate habit makes them ideal for decorative edible gardening [source]

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Pollinator support

Wildlife

Tomato flowers attract bees and other pollinators to the garden, supporting broader ecosystem health and benefiting nearby vegetable crops through improved pollination [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 when fruits reach deep purple color and yield slightly to gentle pressure. Purple tomatoes may have green shoulders—this is normal and not an indicator of immaturity. Pick regularly to encourage continuous production. Fruits can be picked at mature-green stage and ripened indoors in a warm location. Best flavor develops when allowed to fully ripen on the vine. Morning harvest typically offers optimal flavor

Fun Facts

🌱 Purple tomatoes derive their deep color from anthocyanins, the same pigments found in blueberries and blackberries, making them far more antioxidant-rich than traditional red varieties.
🌱 Cascadia Deep Purple was developed by crossing modern disease-resistant tomato genetics with heirloom purple varieties, combining reliability with exceptional flavor.
🌱 Cherry tomatoes produce more fruit per plant than larger slicing varieties and have a longer harvest season—some plants can produce 200-300 individual fruits in a single season.

Gardening Terms

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

Full Sun pH Pollination Transplant True Leaves

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