Planting Timeline
Showing dates for Stupice in USDA Zone 7
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Stupice · Zones 2–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | March – April | May – June | — | July – September |
| Zone 4 | March – April | May – June | — | July – September |
| Zone 5 | March – April | May – June | — | July – October |
| Zone 6 | February – April | April – May | — | June – October |
| Zone 7 | February – April | April – May | — | June – October |
| Zone 8 | January – April | March – May | — | May – November |
| Zone 9 | January – March | March – April | — | May – December |
| Zone 10 | December – February | February – March | — | April – December |
Complete Growing Guide
Start your Stupice seeds indoors 6-8 weeks before your last frost date, using a quality seed-starting mix and keeping soil temperature around 70-75°F for optimal germination. Unlike most tomatoes that need coddling, Stupice seedlings can handle cooler conditions, making them perfect if you have limited indoor space with heat.
Prepare your planting site with well-draining soil enriched with 2-3 inches of compost. While Stupice adapts to various soil types, it performs best in slightly acidic to neutral soil (pH 6.0-7.0). Choose a location with full sun exposure, though this variety tolerates morning shade better than most tomatoes.
Transplant outdoors when soil temperature reaches 55°F consistently – you can plant Stupice 1-2 weeks earlier than heat-loving varieties. Space plants 24-30 inches apart since this compact indeterminate won't sprawl like larger varieties. Install sturdy 6-foot stakes or cages immediately, as the heavy fruit clusters will need support throughout the season.
Feed with a balanced fertilizer (10-10-10) at planting, then switch to lower nitrogen once flowering begins to encourage fruit development over foliage. Apply a 2-4-6 fertilizer every 3-4 weeks during peak growing season. Mulch around plants with 2-3 inches of straw or shredded leaves to maintain soil moisture and suppress weeds.
Prune suckers regularly to maintain good air circulation, but don't over-prune this variety – its compact growth habit means it won't become unmanageable. Focus on removing suckers below the first flower cluster and any that grow in the main stem crotches.
Avoid the common mistake of overwatering, which can dilute the excellent flavor Stupice is known for. Water deeply 1-2 times per week rather than frequent shallow watering. In northern zones (4-6), take advantage of this variety's cold tolerance by extending your season with row covers during unexpected cool snaps. Southern gardeners should plant Stupice for fall harvest when its cool-weather preference shines.
Harvesting
Harvest Stupice tomatoes when they've turned fully red with a slight give when gently squeezed. Unlike larger varieties that may show color while still hard, these 2-3 inch fruits should feel slightly soft at the blossom end when ready. The shoulders should be uniformly red with no green tinge.
Perform the gentle twist test – ripe Stupice tomatoes will separate easily from the stem with a slight twist and upward pull. If resistance is met, wait another day or two. Harvest in the morning after dew has dried but before the heat of the day for best flavor and longest storage life.
Since Stupice produces in clusters, you'll often find fruits at different stages of ripeness. Pick the ready ones individually rather than waiting for the entire cluster. The plant's continuous production means you'll be harvesting 2-3 times per week during peak season. Handle gently despite their good firmness – the excellent flavor comes from thin skins that can bruise easily.
Storage & Preservation
Store freshly harvested Stupice tomatoes at room temperature for 3-5 days to maintain their complex flavor profile. Refrigeration dulls the taste, so only refrigerate if you need to extend storage beyond a week, where they'll keep for up to 10 days.
For preservation, Stupice's balanced sweet-tart flavor makes it exceptional for sauce-making and canning. The smaller size is perfect for whole canning – blanch for 30 seconds, peel, and pack in jars with lemon juice. Their robust flavor concentrates beautifully when slow-roasted and frozen in portions.
Dehydrating works well due to their meaty texture and intense flavor – slice into rounds and dry until leathery. The concentrated flavor of dried Stupice rivals expensive imported tomatoes. For quick preservation, core and freeze whole in freezer bags – the skins slip off easily when thawed, perfect for winter soups and sauces.
History & Origin
Stupice (pronounced 'STOO-peet-say') originated in Czechoslovakia, specifically developed for the challenging climate of the former Czechoslovakian region now part of the Czech Republic. This heirloom was bred by traditional selection methods to combine earliness, cold tolerance, and exceptional flavor – traits essential for tomato cultivation in Central European climates with short, cool summers.
The variety gained popularity among Czech gardeners for its reliability in unpredictable weather and its ability to produce flavorful tomatoes when other varieties failed. It was introduced to North American gardeners in the 1970s through seed exchanges and quickly became prized by northern gardeners and those seeking to extend their growing seasons.
The name 'Stupice' refers to the town where it was developed, and this variety represents the practical breeding philosophy of Eastern European gardeners who prioritized dependability and flavor over size. Today, it's considered one of the finest early-season heirlooms available, maintaining its original characteristics through careful seed saving by dedicated gardeners worldwide.
Advantages
- +Sets fruit reliably in cool temperatures as low as 55°F when other varieties fail
- +Exceptionally early harvest at 65-75 days with complex, rich flavor typically found in later varieties
- +Compact indeterminate growth perfect for smaller gardens and container growing
- +Continuous production from early summer until hard frost extends harvest season
- +Superior cold tolerance allows earlier planting and later harvests than most tomatoes
- +Heavy yields of 2-3 inch fruits in attractive clusters make efficient use of garden space
- +Excellent crack resistance even during periods of irregular watering
Considerations
- -Smaller fruit size (2-3 inches) means more picking time compared to large slicing varieties
- -Indeterminate growth requires consistent staking and sucker removal throughout season
- -Moderate disease resistance means vigilance needed in humid climates prone to fungal issues
- -Peak flavor achieved only when fully tree-ripened, limiting commercial shipping potential
- -Can become overwhelmed by spider mites during hot, dry periods without adequate moisture
Companion Plants
Plant Together
Basil
Repels aphids, whiteflies, and hornworms while potentially improving tomato flavor
Marigold
Deters nematodes, aphids, and whiteflies with natural compounds
Carrots
Helps break up soil for tomato roots and doesn't compete for nutrients
Parsley
Attracts beneficial insects like hoverflies that prey on tomato pests
Chives
Repels aphids and may help prevent fungal diseases
Nasturtium
Acts as trap crop for aphids and cucumber beetles while repelling whiteflies
Lettuce
Provides ground cover and efficient use of space without competing for resources
Borage
Repels hornworms and attracts pollinators, may improve tomato growth
Keep Apart
Black Walnut Trees
Produces juglone which is toxic to tomatoes and causes wilting
Fennel
Inhibits growth of most garden plants including tomatoes through allelopathy
Brassicas
Competes heavily for nutrients and may stunt tomato growth
Corn
Both attract corn earworm/tomato fruitworm, increasing pest pressure
Pests & Disease Resistance
Resistance
Good cold tolerance, moderate disease resistance for an heirloom
Common Pests
Aphids, spider mites, tomato hornworm
Diseases
Early blight, late blight, but generally more resistant than many heirlooms