How to Grow Allegro
Wikimedia Commons
Allegro
Lycopersicon esculentum 'Allegro'
vegetableAllegro is a determinate cherry tomato variety known for its prolific production of small, round, bright red fruits. This compact bush tomato produces clusters of sweet, flavorful tomatoes ideal for fresh eating, salads, and snacking. It's a reliable, early-maturing variety popular in home gardens and commercial cultivation.
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Example Allegro timeline · Pittsburgh, PA (Zone 6b)
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Plant Allegro
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Allegro
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Allegro dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-10; can be grown as annual in zones 3-4
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Get my Allegro timeline →Growth Stages
Seedling
2-3 weeksTiny sprouts emerge with cotyledons (seed leaves). True leaves appear after 1-2 weeks.
Keep soil moist but not soggy. Provide bright light 14-16 hours daily. Maintain 70-75°F. Thin to strongest seedlings.
Vegetative Growth
3-4 weeks indoors; 2-3 weeks after transplanting outdoorsPlant develops sturdy stems and compound leaves. Growth is compact and bushy. No flowers present yet.
Gradually harden off before transplanting outdoors. Plant outdoors when soil reaches 60°F and all frost danger has passed. Support with stakes if needed.
Flowering
2-3 weeksYellow flowers appear in clusters (inflorescences). Plant continues to grow but flowering is the focus.
Ensure consistent watering and adequate calcium. Maintain steady fertilization with balanced or slightly phosphorus-rich formula. Provide air circulation to prevent disease.
Fruiting & Development
3-4 weeksSmall green fruits develop rapidly from spent flowers, clustering in groups. Fruits gradually enlarge and begin color change.
Maintain even watering to prevent cracking and blossom end rot. Continue fertilizing every 2-3 weeks. Prune excess foliage if needed for air circulation but leave sufficient leaf cover.
Ripening & Harvest
4-8 weeks (ongoing until frost)Fruits transition from green to mature red color. Plants may produce continuous waves of ripe fruit over several weeks.
Harvest ripe fruits regularly to encourage continued production. Continue watering consistently. Watch for late-season diseases as foliage ages.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick; encourage parasitic wasps; use Bacillus thuringiensis (Bt) spray; plant trap crops like datura
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Spray with water to dislodge; use neem oil or insecticidal soap; maintain humidity; encourage predatory mites
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Yellow sticky traps; insecticidal soap; neem oil; encourage natural predators like ladybugs
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Remove infected lower leaves; improve air circulation; mulch to prevent soil splash; apply fungicide (copper or sulfur)
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Remove infected foliage; avoid overhead watering; apply copper-based or chlorothalonil fungicide; ensure good drainage
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Remove infected leaves; improve air circulation; apply copper fungicide; avoid wetting foliage
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Maintain consistent soil moisture; add calcium (lime or crushed eggshells); mulch to regulate moisture
Uses
Fresh eating and snacking
CulinaryAllegro cherry tomatoes are sweet, juicy, and ideal for eating fresh from the garden, adding to salads, or serving as healthy snacks. Their small size and prolific production make them perfect for frequent harvesting. [source]
Sauces and cooking
CulinaryThe concentrated sweetness and relatively high sugar content of Allegro tomatoes make them excellent for pasta sauces, roasted tomato preparations, and tomato-based condiments. [source]
Preserving
CulinaryAllegro's abundant yield and uniform size make it ideal for canning, freezing, or making tomato paste and sun-dried tomatoes for long-term storage. [source]
Home gardening and self-sufficiency
HouseholdAs a reliable, productive determininate variety, Allegro is excellent for home gardeners seeking consistent harvests with minimal effort. It's well-suited to containers and small spaces. [source]
Garden biodiversity support
WildlifeTomato flowers attract pollinators like bees and hoverflies, supporting beneficial insect populations while the plant provides habitat and food for garden ecosystems. [source]
Harvest Tips
Harvest when fruits are fully red and slightly soft to the touch. Allegro produces in clusters, so multiple ripe fruits often appear simultaneously. Twist gently or use scissors to avoid damaging the plant. Harvesting regularly encourages continued production. In late season, pick mature green fruits and ripen indoors before first frost.
Fun Facts
- 🌱 Allegro is a determinate variety, meaning it reaches a fixed size and produces most of its fruit within a concentrated window—ideal for succession planting to extend harvest or for canning and preserving.
- 🌱 Cherry tomatoes have been cultivated for centuries in Central and South America, with modern hybrids like Allegro combining productivity with disease resistance.
- 🌱 The lycopene content in fully ripe red tomatoes increases with ripeness and is more bioavailable when tomatoes are cooked with fat, making them beneficial for human health.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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