Stupice Tomato

Stupice ripens faster than almost any other tomato you can grow. It also has some of the most contradictory reviews of any variety online. One grower calls the flavor outrageously delicious. Another calls the same tomato bland and watery.

Both growers are probably right. They just picked at different points in the season.

Reviewer after reviewer describes the exact same pattern. Early fruit tastes thin and watery. Fruit picked later in the season tastes complex, sweet, and balanced. One New Hampshire grower put it plainly. Bland early on, then it improves through midseason and stays strong into late summer. An Alaska grower rated his first fruit as merely average, then came back weeks later to call the flavor superb. If you judge Stupice by its first tomato, you’re judging it unfairly.

Where it came from

Stupice traces back to Czechoslovakia, though the exact history has a few competing threads. One account credits breeder Jaroslav Homola in the 1940s. He worked at the Stupice state farm near Prague, crossing several regional tomato lines to create it. Another account dates a specific cross to 1955 in the village of Stupice itself. It comes from a Czech grower who lists it as his favorite among 20 varieties. Either way, the tomato takes its name from that village.

In 1976, Czech gardener Milan Sodomka read an article in an American gardening magazine. He mailed a packet of seeds to Forest Shomer, founder of the Abundant Life Seed Foundation in Washington state. Shomer’s organization introduced Stupice to American gardeners in 1977. Within a decade, members of the Seed Savers Exchange were already trading it. Nearly 50 years later, it remains one of the most widely grown early tomatoes in North America.

What the fruit is like

Small, round fruit, roughly the size of a golf ball to a tennis ball. Most sources put it around 2 to 2.5 inches across. Individual fruit size still varies quite a bit by grower and growing conditions. The plant carries the distinctive potato leaf foliage rather than the more common regular leaf shape.

Days to maturity is where Stupice earns its reputation. Some sources list as few as 50 days from transplant. Others report closer to 55 to 60 days in typical garden conditions. Either number puts it among the earliest tomatoes available anywhere, hybrid or heirloom.

The plant is indeterminate and can reach 4 to 7 feet given a full season. Still, it stays notably compact and manageable compared to many other indeterminate vines. Growers across very different climates, from coastal Washington to inland Montana to high elevation New Mexico, report strong performance.

Cold tolerance nobody else matches

This is Stupice’s real superpower. Multiple growers report the plant setting fruit at temperatures that stop most other tomatoes cold. One Canadian grower saw fruit set at nighttime lows around 43°F with no problems. An Oregon grower harvested 4 to 5 ounce fruit after frost damage had already hit the plant. A Chicago grower described it setting fruit through cold snaps, heat waves, wind, and partial shade without missing a beat.

That cold hardiness makes Stupice a favorite in short season climates where few other tomatoes reliably ripen before fall frost. Growers in Alaska, Montana, and the Canadian side of the Pacific Northwest specifically recommend it for exactly this reason. One long time Montana grower called it superior to Early Girl for both flavor and speed in his difficult climate.

However, that same cold tolerant breeding works against Stupice in hot regions. Growers in Texas and Florida report weak production, small fruit, and disappointing results across multiple attempts. If you garden somewhere with mild, cool summers, Stupice tends to shine. If you garden somewhere with long, hot summers, other early varieties will likely serve you better.

How to grow Stupice, start to finish

Starting seeds

Start indoors 6 to 8 weeks before your last frost date. Sow seeds a quarter inch deep in clean seed starting mix. Keep the soil temperature between 70 and 80°F for even germination. A heat mat helps hold that range steady.

Set up fluorescent or LED grow lights 2 to 3 inches above the seedlings once they emerge. Pot up to individual containers when the first true leaves appear. Then feed weekly at half strength with a balanced liquid fertilizer until transplant day.

Because Stupice is open pollinated, you can save seed from your best fruit each year. Many longtime growers have kept their own strain going for a decade or longer this way.

Transplanting

This is where Stupice breaks the usual rules. Because it tolerates cold so well, you can transplant it earlier than most tomatoes. Sometimes even before your official last frost date, as long as you’re prepared to cover it during a cold snap.

Harden off over 7 to 10 days first by setting plants outside for increasing periods each day. Bury two thirds of the stem at planting and strip any leaves that would sit below soil level. Deeper planting builds a stronger root system as the season progresses.

Space plants 24 to 30 inches apart. The compact growth habit needs less room than a sprawling beefsteak variety. Still, good airflow matters for keeping foliage healthy.

Soil and feeding

Rich, well drained soil with plenty of compost worked in. Target a pH of 6.0 to 6.8. Work a balanced organic fertilizer into the planting hole before setting the transplant.

Switch to a lower nitrogen tomato feed once flowering starts. Too much nitrogen after flowering pushes leafy growth instead of fruit set. Feed every two weeks through the season for steady production.

Consistent moisture during the early season may help address the watery, bland flavor some growers report from their first fruit. Even watering supports better sugar development from the very start.

Light and water

Full sun, at least 6 to 8 hours daily. Even so, Stupice tolerates partial shade better than most varieties. Multiple growers report solid production in less than ideal light.

Water deeply and consistently, targeting 1 to 2 inches per week. A drip line or soaker hose delivers even moisture at the root zone without wetting the foliage. This matters most during the early fruiting window, since that’s when flavor development seems to lag.

Lay 2 to 3 inches of straw mulch around each plant after a deep watering. Mulch stabilizes soil moisture and helps prevent the splitting some growers report during wet stretches late in the season.

Support and pruning

Stupice grows more compact than a typical indeterminate vine. Still, it benefits from a sturdy cage or stake set at planting time. Some growers successfully grow it with minimal support given its manageable size.

Light pruning keeps the plant tidy without sacrificing much yield. Remove suckers below the first flower cluster. Then let the rest of the plant develop with only light maintenance through the season.

Strip any foliage touching the ground. Even with natural disease tolerance, soil contact still invites problems that resistance alone won’t fully prevent.

Problems to watch

Bland early fruit. This is the single most common complaint, and it’s largely a timing issue rather than a flaw in the variety. Expect the first few tomatoes to taste thinner than what follows. Wait for midseason fruit before forming a final opinion on flavor.

Small fruit size. Some growers expect a full sized slicer and are disappointed by fruit closer to a large cherry. Stupice was never bred for size. Set your expectations around an early, productive snacking and cooking tomato rather than a beefsteak replacement.

Green shoulders. A number of growers note persistent green shoulders on ripening fruit, especially later in the season. This is a common trait on many varieties and doesn’t indicate a growing problem. Our tomato fruit problem guide covers green shoulders and related ripening issues in detail.

Weak performance in hot climates. Growers in Texas and Florida report consistent disappointment across multiple growing seasons. If you garden somewhere with intense, prolonged summer heat, Stupice likely isn’t your best early season choice. Look for a heat tolerant early variety instead.

Splitting in wet weather. Like many thin skinned early tomatoes, Stupice can split after heavy rain following a dry stretch. Consistent watering and mulch reduce this risk significantly.

Container growing

Stupice is a strong candidate for containers thanks to its compact growth habit. Multiple growers confirm success in pots as small as 7 to 10 gallons. Some recommend 15 gallons or larger for the best results.

Use quality potting mix and set a stake or small cage at planting. Water daily in hot weather since containers dry out faster than garden beds. Feed every 7 to 10 days with a balanced liquid fertilizer to replace nutrients that wash out with frequent watering.

One Maryland grower reported a plant over 3.5 feet tall, growing indoors in a container. It bloomed and set fruit well before the outdoor season even started. That kind of adaptability makes Stupice a reasonable choice. It suits gardeners working with limited space or an early indoor head start.

Our guide to growing tomatoes in pots covers container growing in full.

Stupice vs other early tomatoes

Early Girl is the classic comparison for earliness. Several growers directly compared the two and preferred Stupice for both speed and flavor, particularly in difficult, cool climates. Early Girl remains the more widely available hybrid option. Stupice offers the open pollinated alternative, with arguably better cold tolerance.

SunGold comes up often in flavor comparisons, and most growers rank SunGold higher for pure sweetness. However, SunGold is a cherry tomato. Stupice produces a slightly larger fruit, better suited to slicing for sandwiches or quick cooking. Our complete guide to growing tomatoes covers season planning for gardeners stacking early and late varieties together.

The verdict

Stupice earns its reputation as one of the fastest tomatoes you can grow. The cold tolerance genuinely sets it apart from nearly everything else in a seed catalog. Gardeners in short season or cool summer climates get real value here. This variety was built specifically for those conditions decades ago in Czechoslovakia.

The flavor debate makes more sense once you separate early fruit from midseason fruit. Don’t judge this tomato on its first offering. Give it time and keep the water consistent. The reviews calling it outrageously delicious start to make a lot more sense.

If you live somewhere with hot, long summers, other early varieties will likely outperform it. But if cold nights and short seasons are your reality, Stupice remains one of the most dependable answers available.