Yes, you can ripen unblemished green tomatoes picked from blighted plants indoors, but you must act quickly. Discard any fruit showing brown or dark lesions, as the blight can cause internal rot.
Tomato plants cannot recover from blight, as there is no cure for the fungal infection once it sets in. However, if the damage is mild or identified early, you can take swift action to stop the spread and salvage the plant's fruit production for the remainder of the season.
Tomato plants fruit from June until the first frosts, thriving in the warm, light conditions of summer. However, the ripening process slows down as the days become shorter, so fruit that develops from September may not ripen before the first frosts arrive. Tomatoes ripen most quickly in a warm, light environment.
Yes, unblemished tomatoes from plants with blight are safe to eat. However, the fungus itself can cause tissue damage and alter the fruit's acidity. Follow these best practices to ensure safety:
Yes, a diluted hydrogen peroxide spray can help treat and control tomato blight, specifically early blight and various leaf spots, by killing fungal spores through oxidation. It works best as a preventative or early-outbreak treatment to prevent spreading, often mixed at a ratio of 8–12 tablespoons of 3% hydrogen peroxide per gallon of water.
Baking soda can help manage and prevent tomato blight, but it does not technically cure or "kill" existing blight. It works by creating an alkaline environment on the leaf surface that inhibits fungal spores from taking hold and spreading.
Hydrogen peroxide is better for non-porous surfaces, while vinegar works well on porous materials. Choose based on the type of surface you're treating for effective mold removal.
Can I reuse soil after tomato blight? Yes, absolutely. Just as blight cannot live in compost, it also cannot live in soil. It's fine to plant tomatoes in the same spot the following year.
How long tomato blight lingers in your soil depends heavily on the type of blight your plants caught.
To kill and stop the spread of tomato blight (early or late blight), apply a copper fungicide or a broad-spectrum garden fungicide like Daconil. Organic options include copper octanoate or a homemade spray of baking soda, vegetable oil, and dish soap, which alter leaf pH to prevent spores from thriving.
In general, homegrown tomatoes will ripen from late summer to early fall. Factors like temperatures, light conditions, and the variety of tomato you are growing can influence the exact timing.
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Classic ways to use green tomatoes
You can also pickle green tomatoes, packing them into jars with vinegar, dill and garlic. Fried green tomatoes are the next place many of us go: thick slices of green tomato dredged in seasoned flour, fried until golden, and served with a creamy dip or chutney.
To kill blight (such as fungal spores and bacteria) in soil naturally, use methods that focus on soil sterilization, beneficial microbe competition, and physical barriers.
Early blight of tomato (caused by the fungus Alternaria) is characterized by dark, circular spots with concentric "bullseye" rings. It begins on older, lower leaves and can spread to stems and fruit, eventually causing leaves to yellow and drop off.
Regardless of what you might read or see in nursery promotions, planting tomatoes in October or November is not a fruitful experience, literally. The night temperatures are too low for the flowers to set fruit. Tomatoes planted in August or early September will grow quickly in the warm soil, warm nights and long days.
This spray of water and baking soda will change the leaf's pH from around 7.0 to around 8.0. This change is enough to kill and prevent all blight spores!
To treat soil after tomato blight, remove all infected plant debris, avoid planting nightshades (tomatoes, peppers, potatoes) in that spot for 2–3 years, and solarize the soil using clear plastic during hot weather to kill remaining spores. Adding compost and rotating crops helps rebuild soil health and prevents future outbreaks.
If sanitizing, use a bleach solution — one part bleach to nine parts water. There are different ways to treat southern blight in the soil. The soil can be treated with chemicals, inverted (you can try to bury the infected soil, because the blight can only live in the top five inches), or solarized.
The best treatments for tomato late blight rely on preventative contact fungicides like chlorothalonil (e.g., Daconil) for conventional growers, or copper-based sprays for organic gardening. Because late blight is caused by a highly aggressive, wind-borne water mold, these fungicides must be applied preventatively before the disease takes hold.
Whether tomato blight stays in the soil depends entirely on the specific type of blight affecting the plants.
Research has shown that English Ivy can eliminate up to 78% of airborne mold within 12 hours. This makes it particularly useful in humid areas like bathrooms and basements where mold growth is more common.
Depending on the type of fungus, hydrogen peroxide can begin killing it in a few minutes, but resolving the infection completely can take anywhere from 1 to 3 weeks for skin to several months for nail fungus.
The Role of Hydrogen Peroxide in Mold Removal
But here's the critical detail: hydrogen peroxide only works on the surface. It doesn't penetrate materials like drywall, wood, insulation, or carpet — where mold can grow deep into the structure.