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A volunteer tomato is a tomato plant that grows from a seed you didn’t plant, almost always from fruit that fell and decomposed in the soil, and whether it’s worth keeping depends entirely on where it appeared, when it appeared, and what variety it came from.
I know a lot of people pull them out without a second thought, but I’ll be honest, I get a little thrill every time I spot one, especially early in the season. Free tomato plants? Yes please. That said, volunteers aren’t always worth keeping. There are situations where the right call is to pull them immediately, even if they look perfectly healthy. This post covers everything you need to make that call confidently.
What volunteer tomatoes are
A volunteer tomato is any tomato plant that germinates from a seed you didn’t intentionally sow. Seeds end up in the soil a few different ways. The most common is fruit that was missed during harvest, fell, and decomposed where it landed, releasing seeds directly into the soil below. Compost is the second major source. Most home compost piles don’t consistently reach the 130°F (54°C) needed to kill tomato seeds reliably, which means any tomato material you add can produce live seeds that germinate wherever you spread that compost.
Animals move seeds around more than most people realize. Birds, squirrels, and small mammals can carry tomato fruits or pass seeds through their digestive systems and deposit them well away from the original plant. I’ve found volunteers in flower beds, along fence lines, and once in a crack in the path.
These plants emerge from seeds that overwintered in the soil. In colder climates most seeds won’t survive a hard freeze, but seeds protected by mulch or a good layer of organic matter can make it through even in zones you wouldn’t expect. Heirloom varieties tend to produce particularly robust seeds that can remain viable in the soil for several years under the right conditions.
How to identify a volunteer tomato seedling
Volunteer tomato seedlings have distinctive serrated, lobed leaves covered in fine soft hairs, and when you pinch a leaf and rub it between your fingers you get an immediate sharp, green tomato scent. That smell is the fastest and most reliable confirmation. You don’t need to wait and see what the plant grows into. The scent tells you right away. I adore this scent. It reminds me strongly of childhood.
The leaves are medium to dark green, elongated with lobed or deeply toothed edges. Both leaves and stems are covered in that fine fuzz. Run a finger along the stem and you’ll feel it. Young seedlings sometimes show a slight purplish tint on the undersides of the leaves and along the stem, especially in cooler temperatures. That’s normal and not a sign of any problem.
The plant that can confuse people at a very young stage is hairy nightshade, a common weed in the same family. Hairy nightshade has similarly fuzzy stems but rounder, less deeply lobed leaves, and when you crush the leaf the smell is distinctly unpleasant rather than that clean tomato sharpness. If there’s still any doubt, let the seedling grow to 3-4 inches. By that stage the tomato leaf shape is unmistakable.
Volunteers turn up in unexpected places, including compost areas, flower beds, path edges, and spots with no obvious connection to where you grew tomatoes last year. That’s completely normal given how seeds travel.
Do volunteer tomato plants produce fruit?
Yes, volunteer tomato plants can produce fruit, and heirloom volunteers from healthy parent plants often produce excellent fruit. Whether a particular volunteer will produce well depends on what variety it came from and whether it appeared early enough in the season to reach maturity in your zone.
Heirloom and open-pollinated volunteers are the best bet. These varieties are largely self-pollinating, which means they mostly fertilize themselves before outside pollen has a chance to interfere. A volunteer from a known heirloom variety will generally grow true to type and give you fruit very similar to the parent plant. Cross-pollination does happen in tomatoes, but it’s less common than in most other vegetable crops because of how tomato flowers are structured.
Timing matters as much as variety. A volunteer that appears in April in zone 6 has a full growing season ahead of it. One that appears in late June in zone 5 probably doesn’t have enough time left to produce anything useful before frost. I cover how to assess that by zone below.
Will hybrid volunteer tomatoes produce good fruit?
Hybrid tomato volunteers are a gamble, and not necessarily a good one. Hybrids are created by deliberately crossing two different parent varieties, and their seeds don’t breed true. The plant that grows from a saved hybrid seed can take after either parent, show a random mix of traits from both, or produce fruit that’s mediocre, oddly shaped, or nearly flavorless. You won’t know until the plant actually fruits, and by then you’ve spent the whole season on it.
I grow mostly heirloom varieties for exactly this reason. I want to know what I’m getting, and I want to save seed from it. If your garden is all hybrids and you’re finding volunteers, treat them as an experiment rather than a reliable food source. If you live somewhere with particularly challenging disease pressure or a difficult climate, hybrids may be necessary for a decent harvest at all, but that’s a separate question from what to do with the volunteers they leave behind.
RELATED POST: How to Make Tomato Plants Produce More Fruit
Are volunteer tomatoes safe to eat?
Volunteer tomatoes are safe to eat in clean soil, and the fruit itself is no different from any other tomato. The safety question really comes down to where the seedling has appeared.
If a volunteer shows up in soil you know has been exposed to heavy metals, pesticides, or chemical runoff, pull it and don’t eat the fruit. Soil contamination doesn’t wash off at the sink. This matters more for volunteers than for planned crops because volunteers can appear in spots you’d never normally plant food. Alongside a treated fence line, near old painted structures, in areas where weed killers have been used, close to a road or alley. If you have any doubt about the soil in a particular spot, the answer is no.
For volunteers growing in clean, well-managed garden soil you know well, apply the same common sense you’d use for any fresh produce. Wash the fruit thoroughly before eating, and inspect the plant for signs of disease or significant pest damage before you harvest. A volunteer with heavy dark spotting on the lower leaves, fruit cracking or rotting at the stem end, or visible mold is one to discard rather than eat.
RELATED POST: Controlling Tomato Hornworms Naturally
Can tomato plants reseed themselves?
Yes, tomato plants reseed themselves readily, and how reliably they do it depends mostly on variety and winter temperatures. Heirloom and open-pollinated varieties tend to reseed more successfully than hybrids because they produce genetically stable seeds that are more likely to survive and germinate true to type.
Tomatoes are technically tender perennials. In their native warm climate they’d keep growing indefinitely. In US growing zones where winter temperatures drop below freezing, the plants die off each season, but not before dropping seeds. Whether those seeds make it through winter depends on how cold the winter was and how well protected the seeds were by mulch or organic matter above them. Zones 7 and warmer see fairly reliable volunteer production most years. In zones 4-6, it’s more variable. A mild winter produces plenty of viable volunteers the following spring; a hard one kills most seeds before they get the chance.
Compost deserves specific attention here. If you’re adding tomato scraps, trimmings, or whole fruits to a home pile that doesn’t run consistently hot, assume those seeds are alive. They’ll germinate wherever you spread that compost, which is how volunteers end up in the most surprising corners of the garden.
The disease risk you need to know about
Volunteer tomatoes growing in soil where nightshade disease was present the previous season can carry and spread early blight and Septoria leaf spot to your main planting, and this risk is serious enough that most posts on this topic do you a disservice by treating it as a footnote.
Early blight (Alternaria solani) and Septoria leaf spot are among the most common and damaging tomato diseases in the US. The fungi that cause both overwinter in infected plant debris and soil. Volunteer tomato plants are a primary inoculum source for early blight. A volunteer growing in soil where either disease was present last year is already in contact with overwintered spores. It can become infected before your main transplants are even in the ground, then act as a reservoir that spreads disease to everything growing near it.
The rotation rule exists precisely because of this. Rotate out of tomatoes and related crops for at least two to three years after a disease outbreak in a bed. All nightshade family crops, including tomatoes, peppers, potatoes, and eggplant, need to stay out of that bed during the rotation period. A volunteer growing in the same spot is breaking your rotation whether you planted it there or not.
The warning signs to watch for on any volunteer seedling: dark, target-like spots with concentric rings on the lower leaves indicate early blight; small round spots with a lighter center and darker border on the leaves suggest Septoria; yellowing that starts at the bottom of the plant and works upward points to both. If you see any of these on a volunteer before your main planting is in the ground, pull it immediately. Don’t compost it. Bag it and put it in the trash, or burn it if you can. A diseased volunteer in the compost pile just brings the problem back next season.
A volunteer appearing in clean soil with no disease history in that bed is a completely different situation, and one worth evaluating on its own merits.
Should you keep your volunteer tomato plants?
Keep a volunteer if it’s growing in soil with no tomato disease history, if it appeared early enough in your zone to reach maturity before your first frost, and if you have reason to believe it’s come from an heirloom or open-pollinated variety. Move it if it’s appeared in the wrong spot but otherwise ticks those boxes. I’ve lifted volunteers from flower beds and the compost area more than once and grown them on to a good harvest. My tomato and pepper varieties are nearly all heirlooms, which simplifies this decision for me. I know what the parents were and I know what I’m likely getting. If you grow a mix of heirlooms and hybrids, there’s more uncertainty to factor in.
Pull and discard a volunteer if it’s in a bed where tomato disease appeared last year, if it showed up too late to mature in your zone, if it’s already showing signs of disease, or if it’s growing in soil you have any doubt about. The disease risk is real. One free plant is not worth losing your main tomato crop over.
Space is also worth thinking through honestly. A volunteer growing between your planted rows and already getting sizeable competes for water, nutrients, and light just like any other plant. If it’s in a spot where it won’t crowd anything out, the calculation is different from one that’s already elbowing into your pepper bed. Volunteers in the wrong spot need to come out, even if they’re perfectly healthy.
Is it too late in the season to keep this volunteer?
A volunteer tomato needs at least 60-65 days of good growing conditions to produce cherry tomatoes from the time it’s established, and 75-85 days or more for large slicers and paste varieties. If your volunteer doesn’t have that much time before your average first frost date, you’re unlikely to get a worthwhile harvest from it.
Here’s a rough guide by zone:
Zone 4 (average first frost mid-September): A volunteer that appeared in May or very early June may just make it with a fast-maturing cherry variety. Large tomatoes appearing after early June are almost certainly not worth keeping.
Zone 5 (average first frost early to mid-October): A May or early June volunteer has good odds if it’s healthy and has been growing well. Anything appearing in July is marginal for cherry types and a poor bet for slicers.
Zone 6 (average first frost late October): More room to work with. A June volunteer is fine. Early July cherry types may still make it if they get established quickly.
Zones 7-8 (average first frost late October to November): June and early July volunteers have solid prospects. Later appearances are a judgment call based on how fast the particular variety matures.
Zones 9-10: Timing is rarely the limiting factor. Volunteers can produce well into winter.
If you’re on the borderline and wondering whether the plant is actively growing, soil temperature is worth checking. This soil thermometer has great reviews. Tomatoes slow significantly below 60°F (15°C) in the soil and essentially stop growing below 50°F (10°C). If the soil is still warm enough and you have a realistic chance of getting cherry tomatoes before frost, it may be worth trying for. For large slicers or paste varieties in a borderline situation, I’d pull the volunteer and free up that space.
How to care for volunteer tomatoes
Caring for a volunteer tomato is the same as caring for any other tomato in your garden, with one extra step at the start if the plant needs to be moved to a better location first.
Water deeply and infrequently rather than a little every day. Tomatoes do best with around 1-2 inches of water per week, delivered at the base of the plant rather than overhead. Wet foliage accelerates fungal disease, and that risk is already more of a consideration with volunteers than with your main planting.
Fertilize with a balanced DIY natural fertilizer every two to three weeks through the growing season. Hold back on heavy nitrogen feeds once the plant starts setting flowers. Too much nitrogen at that stage pushes leafy growth at the expense of fruit, which is the last thing you want from a plant that’s already working against the season’s clock.
Get a stake or cage in place early like this one from H&L Group. Volunteer tomatoes grow just as large as any plant you’ve deliberately raised from seed, and trying to support a sprawling plant that’s already falling over is a much bigger job than getting support in place when the plant is still small. Watch for pests consistently too. Grasshoppers are a common and destructive tomato pest, and catching any pest problem early makes a significant difference to the outcome.
Remove suckers regularly. These are the small shoots that emerge in the crotch between the main stem and a side branch. Removing them keeps the plant manageable, improves airflow, and focuses the plant’s energy on fruit rather than more vegetation.
How to transplant a volunteer tomato to a better spot
The best time to transplant a volunteer is when the seedling has two full sets of true leaves and is around 3-4 inches tall. At that stage the root system is developed enough to survive the move but compact enough to lift cleanly without disturbing a wide area.
Water the soil around the seedling thoroughly about an hour before you dig. Use a trowel and go wider than seems necessary. A generous circle around the root zone brings more roots up intact. Lift the whole root ball rather than pulling the stem. Get the plant into its new hole and water it in immediately.
Shade the transplant during the hottest part of the day for the first 2-3 days after moving it. A piece of floating row cover, a square of burlap, or a propped-up piece of cardboard does the job. After that, remove the shade and let it grow on normally. Volunteers, having already proven themselves sturdy enough to germinate and grow without any help, tend to bounce back from transplanting faster than seedlings raised under cover.
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Save your own seed instead of chasing volunteers
If what you’re really after is free, reliable tomato plants next season, saving seed from your best plants this year is a more dependable route than relying on whatever volunteers happen to appear.
Seed saving gives you everything a volunteer gives you, at zero cost and from a variety you know, but with full control. You choose which plant the seed comes from, which means you’re selecting the healthiest fruit from the most productive, disease-free plant in your garden rather than gambling on a random seedling from the compost pile that might be carrying last year’s early blight, or might turn out to be from a hybrid parent that won’t grow true. And because you’re working with heirloom or open-pollinated varieties (the only ones worth saving from, since hybrid seeds don’t breed true), you know exactly what you’re planting next spring.
The method is simple and takes about 5 minutes of hands-on time, spread over a few days. Choose a fully ripe fruit from a healthy plant that had a good season. Scoop the seed gel into a jar with a small amount of water and leave it to ferment at room temperature for 2-3 days. The gel coating around each seed contains compounds that inhibit germination, and fermentation breaks those down. After 2-3 days, viable seeds sink to the bottom and debris floats to the top. Rinse the clean seeds, spread them on a plate or paper towel, and let them dry completely before storing. This drying stage can take a week or more and they need to be fully dry, or they’ll mold in storage. Properly dried and stored in a cool, dark, dry location, tomato seeds stay viable for 4-5 years.
Frequently asked questions
What is a volunteer tomato plant?
A volunteer tomato plant is a tomato that grows from a seed you didn’t intentionally plant, usually from fruit that fell and decomposed in the soil, from compost that didn’t heat up enough to kill the seeds, or from seeds carried by birds or other animals to a new spot in your garden.
Do volunteer tomatoes grow true to type?
Volunteers from heirloom or open-pollinated varieties usually produce fruit very close to the parent plant, because tomatoes are largely self-pollinating and cross-pollination is relatively uncommon. Volunteers from hybrid varieties are unpredictable. Hybrid seeds don’t breed true and can produce plants with widely varying characteristics, which makes them an uncertain proposition for food production.
Should I remove volunteer tomatoes?
It depends on the specific situation. Remove volunteers that appeared in beds where tomato disease was present last year, that showed up too late to mature before your first frost date, or that are already showing signs of disease. Keep or transplant healthy volunteers that appeared early in the season in clean soil with no disease history, and that you can reasonably identify as coming from an heirloom variety.
Can volunteer tomatoes spread disease?
Yes, and this is a real risk that most gardening resources understate. Volunteers growing in soil where early blight or Septoria leaf spot was active the previous season can carry and spread those diseases to your main planting. University extension guidance specifically names volunteer tomato control as part of early blight management. If your garden had significant tomato disease last year, pull volunteers in those beds rather than growing them on.
Are volunteer tomatoes safe to eat?
Yes, in clean soil with no signs of disease. The fruit from a healthy volunteer is no different from any other homegrown tomato. The only food safety concern is the soil itself: don’t harvest from volunteers growing in ground that’s been contaminated with heavy metals, pesticides, or chemical runoff. In well-managed garden soil you know well, volunteer tomatoes are perfectly fine to eat.
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