How to Grow Mammy
Mammy
Solanum lycopersicum 'Mammy'
vegetableMammy is a determinate beefsteak tomato variety known for its large, flavorful fruits and compact growth habit. Developed in France, it produces heavy yields of deep red, meaty tomatoes with excellent taste. This variety is particularly valued for its disease resistance and reliability in home gardens.
When should you plant Mammy in your zone?
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Example Mammy timeline · Pittsburgh, PA (Zone 6b)
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Plant Mammy
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 Mammy
Around Jun 21≈ 65 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Mammy dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9; can be grown in zones 3-4 with season extension
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Get my Mammy timeline →Growth Stages
Seedling
3-4 weeksYoung plants with 2-4 true leaves, developing compact growth with low branching habit.
Provide bright light 14-16 hours daily under grow lights. Keep soil consistently moist but not waterlogged. Maintain 65-75°F temperature.
Vegetative
3-4 weeks after transplantingBushy determinate plant with multiple stems, reaching 3-4 feet tall. Flowers begin appearing at leaf axils.
Install support cage or stakes early. Begin moderate fertilizing with balanced NPK. Prune suckers cautiously (minimal pruning for determinate types). Harden off before transplanting outdoors.
Flowering
2-3 weeksDense clusters of yellow flowers appear throughout the plant. Compact determinate growth concentrated on main stem.
Maintain consistent watering to prevent blossom end rot. Begin phosphorus-rich fertilizing. Ensure adequate pollination through air circulation or light hand-tapping of flowers.
Fruiting
3-4 weeks for first fruitsLarge, meaty beefsteak fruits develop, reaching 8-16 oz. Fruits are deep red when ripe with minimal seeds and thick walls.
Continue consistent watering (critical at this stage). Reduce nitrogen to avoid excess foliage. Provide shade cloth in extremely hot climates (over 95°F). Monitor for crack resistance.
Harvest
2-4 weeks of peak harvestingAbundant ripe, deep red fruits ready for picking. Determinate variety produces most fruit within concentrated 2-3 week window.
Harvest when fully colored and slightly soft to touch. Harvest frequently to encourage continued production. Remove diseased leaves during harvest.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick larger caterpillars; use Bacillus thuringiensis (Bt); encourage parasitic wasps; inspect plants regularly
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Use reflective mulch; spray insecticidal soap or neem oil; introduce natural predators like ladybugs
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Improve air circulation; remove lower infected leaves; apply copper fungicide; water at soil level only
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Apply chlorothalonil or copper fungicides preventatively; ensure good drainage; avoid overhead watering
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Increase humidity through misting; use strong water spray; apply neem oil or miticide if severe
Uses
Fresh eating and slicing
CulinaryMammy's large, meaty fruits with few seeds make them ideal for slicing in salads, sandwiches, and fresh eating. The excellent flavor and thick flesh provide superior taste compared to many commercial varieties. [source]
Canning and preserving
CulinaryThe determinate growth habit concentrating fruit harvest makes Mammy ideal for processing and canning. Its low seed count and high flesh-to-water ratio produce excellent tomato sauce, paste, and juice. [source]
Cooking and sauces
CulinaryMammy's meaty texture and rich flavor make it excellent for cooked sauces, soups, and stews. The concentrated harvest period allows for bulk cooking and freezing. [source]
Home garden production
HouseholdMammy's compact determinate growth and disease resistance make it an excellent choice for container gardening, small spaces, and reliable home production without extensive pruning. [source]
Lycopene-rich nutrition
MedicinalRipe red tomatoes like Mammy contain high levels of lycopene, an antioxidant associated with cardiovascular health and cancer prevention. Cooking tomatoes increases bioavailability of lycopene. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Pick fruits when fully red and slightly yielding to gentle pressure. Mammy's determinate growth habit means most fruit ripens within a concentrated 2-3 week window, making it excellent for canning and preserving. Twist gently or use pruners to avoid branch damage. Morning harvest provides best flavor and shelf life.
Fun Facts
- 🌱 Mammy was developed in France and has become particularly popular in European home gardens for its exceptional disease resistance and flavor profile.
- 🌱 The name 'Mammy' reflects the large, maternal nature of the substantial fruits it produces, with individual tomatoes often weighing half a pound or more.
- 🌱 Its determinate growth habit makes it unique among beefsteak varieties—most beefsteak tomatoes are indeterminate, but Mammy concentrates all fruit ripening into a shorter window, making it ideal for preservation.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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