Every gardener knows the joy of seeing those first spring seedlings pop up in neat, intentional rows. But sometimes, nature has its own plans. Volunteers, and especially volunteer tomatoes—those unexpected plants that sprout from seeds dropped or left behind from last season—are one of the happiest surprises you can find in your garden.
While all volunteers in the flower bed or the vegetable beds are wonderful, I especially love volunteer tomatoes in the garden and I want to cheer them on, saying “go little seedling, go”! They are a testament to the resilience and persistence of nature, quietly reminding us that life finds a way even without our careful planning.
Table of Contents
- Where They Come From
- Heirlooms vs. Hybrids: What to Expect
- The Pros of Volunteer Tomatoes
- Potential Downsides
- The Hidden Advantage: Local Acclimation & Epigenetics
- Should You Keep Them?
- Caring for Volunteer Tomatoes
- Tips for Saving the Best Volunteer Seeds
Where They Come From
Volunteer tomatoes often appear in spots you never planted them—alongside the compost pile, nestled between your peppers, or sprouting up from a forgotten corner of last year’s bed. Their seeds can come from:
- Fallen fruit left on the ground the previous season
- Tomato scraps tossed into compost that wasn’t fully broken down
- Seeds spread by birds or other wildlife
Heirlooms vs. Hybrids: What to Expect
Not all volunteer tomatoes are created equal, and the parent variety can make a big difference.
- Heirloom volunteers are more likely to grow true to the parent plant, producing fruit similar in taste, color, and shape. They tend to be genetically stable, so what you see is usually what you get.
- Hybrid volunteers may surprise you with unpredictable results. Because hybrids are the result of two parent varieties, their seeds often “split” genetically, producing plants and fruit that MAY differ from the original. Sometimes the results are delicious and beautiful, and other times… less so. But the element of surprise can be part of the fun.
Unfortunately, we don’t always know which of these two tomato types the volunteer will be. If you only plant heirlooms and the volunteer is right next two where you planted your tomatoes last, year, you can be reasonably sure it is from a fallen fruit and will be another heirloom similar to the parent plant.
But if you plant many varieties of tomatoes, and your little baby tomato is out in a different part of your yard, in your flower beds, or near your compost, the seed was likely either dispersed by a bird, or a remnant from compost. It is much harder to ascertain exactly what the tomato will be and whether it will be what you want to expend precious planting area on without seeing the fruit.
The Pros of Volunteer Tomatoes
While some gardeners view them as weeds, volunteer tomatoes can be a gift. They:
- Save you money—no need to buy or start new plants for those spots
- Often grow with vigor, need less water, and are already adapted to your local soil and climate (epigenetics!)
- Sometimes produce earlier than your intentionally planted tomatoes
- Can be a source of fun experiment and a mystery—what variety will they be?
Potential Downsides
It’s not all sunshine and ripe fruit, though. Volunteer tomatoes can:
- Carry over soil-borne diseases from the previous season if you had any in your garden
- Grow in inconvenient spots, crowding out other plants or blocking pathways
- Cross-pollinate, leading to fruit that’s different from the original
- If they show up too near your existing tomatoes, they can rob your intentionally planted vegetables of nutrients
- Look messy if not in the right spot or if not managed
The Hidden Advantage: Local Acclimation & Epigenetics
One of the lesser-known benefits of volunteer tomatoes is their natural hardiness. Seeds that overwinter and germinate on their own often come from plants that have already proven they can survive your specific soil, microclimate, and pest pressures. Over time, these survivors can develop subtle epigenetic adaptations—changes in how their genes are expressed—that make them even better suited to your garden than store-bought seedlings. These plants may be more resilient to local stressors like heat, drought, or certain pests.
So if you’re fortunate enough to get a volunteer heirloom whose traits are relatively stable, or one of the tasty hybrid volunteers (yes, they do happen!), you could be improving the genetic viability for your uber-locality.
Should You Keep Them?
The decision comes down to space and health. If the plant looks strong and won’t interfere with your garden plan, it’s often worth giving it a chance. On the other hand, if it’s in a poor location or the plant itself appears weak, you may be better off pulling it and focusing on your planned crop. If you do keep it, you’ll need an extra cage and amendments.
And if you grow mostly hybrid tomatoes, if you have a small plot, or if you just don’t want these hardy offspring in your garden, my best advice is to be diligent about clearing out all debris including fallen tomatoes at the end of each season. This will ensure that there are no overwintering seeds in your beds. You can’t prevent birds from dispersing seeds, but you can at least keep your primary plot volunteer-free.
Caring for Volunteer Tomatoes
Treat them much like your intentional tomato plants:
- Stake or cage them early to provide support. Yes, they can grow just as big as your other tomatoes. Sometimes bigger.
- Provide them with a boost of monthly fertilizer
- Mulch to retain moisture and prevent soil splash
- Prune as needed for airflow
- Watch for pests and diseases; volunteers from a hybrid may not exhibit the same resistance as their parent plants.
Tips for Saving the Best Volunteer Seeds
If you discover a volunteer tomato that produces great-tasting, healthy fruit, you can save its seeds to grow in the future:
- Choose your healthiest plants – Avoid any with signs of disease.
- Select fully ripe fruit – Let it ripen on the vine for the best seed maturity.
- Ferment the seeds – Scoop them into a jar with a little water and let them sit for 2–3 days to remove the gel coating.
- Rinse and dry – Spread them on a plate or paper towel to air-dry completely.
- Label and store – Keep in a cool, dry place until next planting season.
By doing this year after year, you can create your own line of tomatoes that’s uniquely adapted to your garden—nature’s version of a custom seed breeding program.
Sometimes the best garden surprises are the ones you didn’t plan. Volunteer tomatoes may pop up uninvited, but they often bring a touch of nostalgia and a reminder of the resilience of nature. Whether you decide to nurture them into full production or simply enjoy their unexpected appearance, these self-seeded plants add a bit of mystery and charm to the gardening season. After all, in a world of carefully planned beds and perfectly spaced rows, a little spontaneity can be just as rewarding as the crops you sowed on purpose.
