Iron Lady
Solanum lycopersicum 'Iron Lady'
A breakthrough hybrid specifically bred for superior disease resistance without sacrificing flavor, making it perfect for organic gardeners and areas with challenging growing conditions. This dependable variety produces excellent yields of flavorful, medium-sized fruits even when other tomatoes struggle with disease pressure. Iron Lady proves that you don't have to choose between disease resistance and great taste.
Harvest
75-80d
Days to harvest
Sun
Full sun
Zones
10–11
USDA hardiness
Height
1-10 feet
Planting Timeline
Showing dates for Iron Lady in USDA Zone 7
All Zone 7 tomato →Zone Map
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Iron Lady · Zones 10–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | April – April | June – July | — | September – October |
| Zone 4 | March – April | June – June | — | August – October |
| Zone 5 | March – March | May – June | — | August – October |
| Zone 6 | March – March | May – June | — | August – October |
| Zone 7 | February – March | April – May | — | July – September |
| Zone 8 | February – February | April – May | — | July – September |
| Zone 9 | January – January | March – April | — | June – August |
| Zone 10 | January – January | February – March | — | May – July |
| Zone 1 | May – May | July – August | — | October – August |
| Zone 2 | April – May | June – July | — | September – September |
| Zone 11 | January – January | January – February | — | April – June |
| Zone 12 | January – January | January – February | — | April – June |
| Zone 13 | January – January | January – February | — | April – June |
Complete Growing Guide
Iron Lady's primary advantage lies in its robust resistance to early and late blight, so you can space plants closer together (24 inches apart) without fear of fungal spread that would devastate susceptible varieties. Plant 75-80 days before your first frost to ensure fruit maturity, and provide consistent moisture—this hybrid's vigor makes it less prone to splitting than heirloom types. While the indeterminate growth habit demands sturdy support (stakes or cages), Iron Lady rarely exhibits the excessive leafiness that shades fruit in disease-prone climates, actually allowing better air circulation around the canopy. Focus your pruning efforts on lower branches rather than aggressive topping to maintain the plant's natural disease-fighting architecture. For best results, mulch heavily to prevent soil-borne pathogens from splashing onto leaves during rain, a critical practice in humid regions where this variety truly outshines standard tomatoes.
Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 10 ft. 0 in.. Spread: 1 ft. 0 in. - 4 ft. 0 in.. Spacing: 3 feet-6 feet. Growth rate: Rapid. Maintenance: High. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.
Harvesting
Harvest Iron Lady tomatoes when they reach full medium size and display a deep red color throughout, as this hybrid develops excellent flavor at complete maturity. The fruits should yield slightly to gentle pressure but still feel firm, indicating peak ripeness without overripeness. These determinate-type plants typically produce concentrated yields suitable for successive harvesting rather than a single-pick approach, so check plants every 2-3 days once fruiting begins. Time your main harvest in early morning when temperatures are coolest to preserve flavor compounds and ensure the longest shelf life, particularly important for this disease-resistant variety bred to maintain quality even in humid conditions.
The fruits are smooth, shiny, glossy, and are classified as berries. The size, shape, and color will vary depending on the variety or cultivar. The color of the fruits may be red, yellow, orange, green, purple, or pink. The fruits may contain over 100 yellow to light brown seeds.
Color: Gold/Yellow, Green, Orange, Pink, Purple/Lavender, Red/Burgundy, Variegated. Type: Berry. Length: > 3 inches. Width: > 3 inches.
Garden value: Edible, Showy
Harvest time: Fall, Summer
Edibility: The fruits or berries of the tomato are edible. They may be eaten raw, cooked, dried, or processed. They are a rich source of Vitamin A, Vitamin C, folic acid, and antioxidants. Lycopene is an antioxidant that gives the tomato its rich red color. Many plants will drop fruit when ripe or the fruit will come off easily. Tomatoes will continue to ripen once picked. Store them at room temperature.
Storage & Preservation
Harvest Iron Lady tomatoes when fully ripe for best flavor, then store at room temperature away from direct sunlight rather than refrigerating, which dulls their classic taste. Maintain 65-70°F and moderate humidity for optimal keeping. Fresh tomatoes will hold for 5-7 days at room temperature before softening. For longer preservation, this dual-purpose variety excels at both canning and sauce-making due to its balanced acid-sugar profile. Process whole or crushed tomatoes using standard water-bath or pressure-canning methods. Freezing works well for cooking purposes—simply core and freeze whole, or blanch and peel before freezing in containers. Dried tomato halves concentrate their sweetness beautifully and store for months in airtight containers. Given Iron Lady's generous yields, consider preserving in batches to avoid waste during peak season.
History & Origin
The specific origins and breeding history of 'Iron Lady' tomato remain largely undocumented in readily available horticultural records. The variety appears to be a modern hybrid introduction, likely developed within the last two decades by a commercial seed company focused on disease-resistant cultivars for organic and sustainable agriculture markets. While the exact breeder, year of introduction, and parentage are not clearly established in public sources, 'Iron Lady' belongs to the broader lineage of contemporary disease-resistant hybrid tomatoes bred to combine vigor and productivity with resistance to common fungal and bacterial diseases. The variety's name and marketing emphasis suggest intentional selection for reliability and strength under challenging growing conditions.
Origin: Peru
Advantages
- +Exceptional disease resistance makes Iron Lady ideal for organic gardeners
- +Well-balanced flavor proves disease resistance doesn't compromise taste quality
- +Medium fruits produce excellent yields even in challenging conditions
- +Moderate 75-80 day maturity allows reliable harvests in shorter seasons
- +Easy cultivation requires minimal expertise for successful growing
Considerations
- -Susceptible to blossom end rot when watering becomes inconsistent
- -Medium fruit size may disappoint gardeners wanting large beefsteak tomatoes
- -Still vulnerable to fruitworms, aphids, and flea beetles despite resistance
Companion Plants
Marigolds — French marigolds (Tagetes patula) specifically — pull their weight near Iron Lady. Their roots exude alpha-terthienyl, which suppresses root-knot nematodes (Meloidogyne spp.) in the surrounding soil, and their scent disrupts host-location by aphids and tomato fruitworm moths (Helicoverpa zea). Basil is a standard pairing, though the honest reason to grow it 18 inches away from your tomato cage is the harvest bowl, not any proven pest-suppression mechanism. Carrots and chives are good edge plants because they stay shallow enough to avoid competing for the deep, consistent moisture Iron Lady demands, and chives have documented repellent effects on aphids at close range.
Fennel produces allelopathic compounds that stunt most garden vegetables — keep it at least 10 feet from your tomato bed, or just put it in a pot by itself. Corn looks like a harmless neighbor but shares the same primary pest: tomato fruitworm and corn earworm are the same insect, Helicoverpa zea, and growing the two crops side by side concentrates populations and gives the moth a continuous food source from midsummer on. Brassicas compound the problem by importing their own pest complex — imported cabbageworm, harlequin bug — into beds that are already doing pest management work for nightshades.
Plant Together
Basil
Repels aphids, whiteflies, and hornworms while potentially improving tomato flavor
Marigolds
Deters nematodes, aphids, and whiteflies with their strong scent
Carrots
Helps break up soil for tomato roots and doesn't compete for nutrients
Parsley
Attracts beneficial insects like hoverflies that control aphids
Chives
Repels aphids and may help prevent fungal diseases
Nasturtiums
Acts as trap crop for aphids and cucumber beetles
Oregano
Repels many pests and may enhance tomato growth
Lettuce
Provides ground cover and shade, helping retain soil moisture
Keep Apart
Black Walnut
Releases juglone toxin that causes tomato wilt and stunted growth
Fennel
Inhibits growth of most garden plants through allelopathy
Brassicas
Compete for nutrients and may stunt tomato growth
Corn
Both attract corn earworm/tomato fruitworm, increasing pest pressure
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #321360)
Pests & Disease Resistance
Resistance
Exceptional resistance to late blight, early blight, fusarium wilt, verticillium wilt, and bacterial speck. Outstanding overall disease package.
Common Pests
Tomato fruitworm, aphids, cutworms, flea beetles
Diseases
Highly resistant to most common tomato diseases, occasionally susceptible to blossom end rot in inconsistent watering
Troubleshooting Iron Lady
What you'll see, why it happens, and what to do about it.
Dark, sunken, leathery patch on the blossom end of fruit, appearing as tomatoes size up
Likely Causes
- Blossom end rot — calcium not reaching the developing fruit due to inconsistent soil moisture, not a calcium-deficient soil
- Irregular watering (drought-then-flood cycles block calcium uptake even when Ca is present)
What to Do
- 1.Water deeply and consistently — Iron Lady needs high, steady moisture; let the top inch dry slightly, then water thoroughly rather than giving light daily sprinkles
- 2.Mulch 3-4 inches deep with straw to buffer soil moisture swings
- 3.Pull and toss affected fruit — they won't recover, but fixing the watering will stop new ones from developing the same problem
Small ragged holes chewed in leaves near the soil line, or young transplants cut off at the base overnight
Likely Causes
- Cutworms (Agrotis spp.) — fat, soil-dwelling caterpillars that feed at night and sever stems at or just below the soil surface
- Flea beetles — tiny, fast-jumping beetles that pepper leaves with small round holes, especially on young transplants
What to Do
- 1.For cutworms, place a physical collar (a paper cup with the bottom cut out, or a 3-inch cardboard ring) around each transplant stem at planting, pressing it 1 inch into the soil
- 2.For flea beetles, row cover immediately after transplanting keeps them off until plants are established and better able to tolerate minor feeding pressure
- 3.Scratch the soil around affected plants in the evening — you'll often find cutworms an inch or two down and can remove them by hand
Foliage wilting during the day even with adequate soil moisture, no obvious stem damage above ground
Likely Causes
- Southern bacterial wilt (Ralstonia solanacearum) — cut the stem near the base and hold it in a glass of water; if thin bacterial threads stream out, this is the likely culprit
- Root-knot nematodes (Meloidogyne spp.) — check roots for small, hard galls; note that Iron Lady carries VFFN resistance but isn't immune to all nematode species or all strains of bacterial wilt
- Early-stage southern stem blight (Athelia rolfsii) — look for white fungal mycelium and small tan seed-like sclerotia at the soil line
What to Do
- 1.NC State Extension advises digging up and destroying affected plants including roots — do not compost them
- 2.Because these soil-borne pathogens persist for years, rotate tomatoes out of that bed for at least 3-4 seasons; NC State's IPM guidance suggests 5-7 years for some tomato diseases specifically
- 3.If you're out of rotation space, move to containers and make sure the container mix never contacts native soil
Frequently Asked Questions
How long does Iron Lady tomato take to grow?▼
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Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.