Park’s Whopper is a vigorous indeterminate hybrid tomato that produces large, meaty beefsteak-style fruits, often reaching four inches across or more on healthy plants. Growing it successfully comes down to giving it a long, warm season with full sun, consistent moisture, sturdy support, and enough fertility to keep up with its aggressive growth habit. Because it is an F1 hybrid, it carries built-in disease resistance that makes it more forgiving than many heirloom beefsteaks, but its size and indeterminate growth also mean it demands more attention to staking, pruning, and feeding than a compact determinate variety would.
What Makes Park’s Whopper Different
Sold by Park Seed Company, Park’s Whopper was bred to combine the flavor and heft of old-fashioned beefsteak tomatoes with modern hybrid vigor. The variety is indeterminate, meaning the vines keep growing and setting fruit until frost kills them, rather than stopping at a fixed height the way determinate or “bush” types do. Expect vines that easily reach six to eight feet tall in a good season. The fruits are thick-walled and relatively low in seed cavities, which is what gives slicing beefsteaks their dense, meaty texture.
The hybrid parentage also brings resistance to several common tomato diseases, typically labeled on the seed packet as VFN. That shorthand means the plant carries genetic resistance to Verticillium wilt, Fusarium wilt, and root-knot nematodes. These resistances are not absolute immunity, but they dramatically reduce the odds of losing a plant to soilborne pathogens, especially if you rotate your tomato planting area from year to year.
Starting Seeds and Transplanting
Start seeds indoors about six to eight weeks before your last expected spring frost. Tomato seeds germinate best in warm soil, around 75 to 85°F, so a heat mat under the seed tray speeds things up considerably. Once seedlings have their first set of true leaves (the jagged, tomato-scented ones that appear after the smooth seed leaves), pot them up into individual containers so the roots have room to develop.
Transplant outdoors only after nighttime temperatures stay reliably above 50°F. Tomatoes stall or suffer root damage in cold soil, and Park’s Whopper is no exception. When you transplant, bury the stem deeper than it sat in the pot, leaving just the top few sets of leaves above the soil line. Tomato stems sprout roots along any buried portion, and a deeper root system helps the plant access water during dry spells and anchor itself against wind.
Space plants at least three feet apart in the row if you plan to stake or cage them. Crowding indeterminate tomatoes invites fungal problems by trapping humid air around the foliage, and Park’s Whopper’s large leaf canopy makes airflow even more important than it would be for a smaller-vined variety.
Soil, Sun, and Watering
Full sun is non-negotiable. Park’s Whopper needs a minimum of six to eight hours of direct sunlight per day to produce its best fruit. In partial shade, the vines will grow leggy, set fewer flowers, and the fruits that do develop will take longer to ripen and often taste bland.
The ideal soil is well-drained, rich in organic matter, and slightly acidic, with a pH between about 6.2 and 6.8. If you’re not sure about your soil pH, a simple test kit from a garden center or your local cooperative extension service will tell you where you stand. Working compost into the planting bed before transplanting improves both drainage in heavy clay soils and moisture retention in sandy ones.
Water deeply and consistently rather than lightly and often. Tomatoes that go through cycles of drought followed by heavy watering are prone to blossom end rot, a calcium-uptake problem that shows up as a dark, sunken patch on the bottom of the fruit. It looks like a disease but is actually a physiological issue caused by inconsistent moisture. A couple of inches of mulch around the base of each plant helps buffer soil moisture between waterings and keeps roots cooler during summer heat.
Fertilizing for Big Fruit
Park’s Whopper is a heavy feeder. At transplanting, mix a balanced fertilizer or a slow-release granular product into the planting hole. Once the first flowers appear, switch to a fertilizer with a higher middle number (phosphorus) to support fruit development. Too much nitrogen at the flowering stage pushes the plant to produce lush foliage at the expense of fruit set, a common mistake with beefsteak varieties.
Side-dress with compost or a balanced fertilizer every three to four weeks through the growing season. If you notice the lower leaves yellowing while the upper growth looks healthy, the plant is likely hungry for nitrogen and could use a supplemental feeding. Calcium supplements, either as a foliar spray or a soil drench, can help prevent blossom end rot in soils where calcium levels are low, though consistent watering is usually the more effective fix.
Support and Trellising
An indeterminate beefsteak loaded with heavy fruit will collapse without support, and Park’s Whopper is no exception. Staking or trellising is not optional for this variety. Research on staking methods for indeterminate tomatoes has found that proper support significantly increases marketable fruit yields compared to letting plants sprawl on the ground. In one study comparing staking approaches, the highest marketable yield came from single-string staking, a method where each plant is tied to an overhead wire or tall stake with a single length of twine that wraps loosely around the main stem as it grows.
For home gardeners, the three most practical options are:
- Tall stakes: A single sturdy stake at least six feet tall, driven a foot into the ground, with the main stem tied to it every 12 to 18 inches using soft ties or strips of fabric. This works well if you plan to prune to one or two main stems.
- Heavy-duty cages: Commercial tomato cages sold at big-box stores are usually too flimsy for Park’s Whopper. Look for cages made from concrete reinforcing wire or heavy-gauge welded wire, at least five feet tall. These let the plant branch more freely without tying.
- Florida weave: A string-weaving method used between stakes placed every two plants. You run twine along both sides of the row, sandwiching the plants between the strings and adding new levels of twine as the plants grow. This is efficient when growing several plants in a row.
Whatever method you choose, get the support in place at or shortly after transplanting. Trying to stake a sprawling, fruit-laden vine midsummer without breaking branches is a miserable task.
Pruning and Suckering
Indeterminate tomatoes produce side shoots called suckers in the joint between the main stem and each leaf branch. Left alone, every sucker becomes a new fruiting stem, which sounds like a good thing until the plant turns into an unmanageable tangle of foliage with lots of small, slow-ripening fruit. For a beefsteak variety where the goal is large individual fruits, some pruning helps.
Research on heirloom tomato pruning found that removing all suckers below the first flower cluster reduced overall yield in some seasons but maintained fruit size, while removing no suckers at all led to the highest total yield but smaller individual fruits.
A practical middle ground for Park’s Whopper is to remove the suckers that form below the first flower cluster and then let the plant develop two or three main stems from there. This keeps the canopy open enough for good air circulation while still giving the plant enough leaf area to fuel big fruit. Removing the lowest suckers also lifts the foliage off the ground, which reduces splashback of soil onto leaves during rain and helps prevent early blight and other fungal infections.
Also remove any leaves that are touching the soil, yellowing, or showing disease spots. These are no longer contributing much energy to the plant and serve mainly as a landing pad for fungal spores. Late in the season, about a month before your first expected frost, some growers “top” their indeterminate plants by cutting off the growing tip of each stem. This redirects the plant’s energy into ripening the fruit already on the vine rather than setting new fruit that won’t have time to mature.
Common Pests
The pests most likely to bother Park’s Whopper are the same ones that plague tomatoes generally. Hornworms, both the tobacco hornworm and the tomato hornworm, are the most dramatic. These caterpillars can strip a branch of foliage overnight and grow to the size of a finger. They’re well camouflaged but easy to spot once you know what to look for: dark droppings on the leaves below and missing foliage at the branch tips. Hand-pick them off or let parasitic braconid wasps do the work if you see white cocoons studding a hornworm’s back. Research comparing pest pressure on tomatoes grown in high tunnels versus open fields found that hornworms can actually be more abundant in protected growing environments, which is worth noting if you grow under cover.
Aphids and whiteflies are smaller nuisances that tend to cluster on the undersides of leaves and new growth. A strong spray of water knocks most of them off, and insecticidal soap handles heavier infestations. That same field-versus-tunnel study found that greenhouse-associated pests like aphids and whiteflies were more common in high tunnels than in open-field plots, so covered growing spaces are not automatically lower-pest environments for tomatoes.
Tomato fruitworm, also called corn earworm, bores into ripening fruit and ruins it from the inside. Bacillus thuringiensis (Bt) sprays applied when the caterpillars are small are an effective organic control. Checking fruits regularly and harvesting promptly when they color up reduces fruitworm damage as well.
Disease Prevention
Park’s Whopper’s built-in VFN resistance handles three of the most destructive soilborne tomato diseases, but it does not protect against foliar diseases like early blight, late blight, or Septoria leaf spot. These fungal problems spread by splashing water and humid air, and they’re the reason tomato foliage management matters so much.
Prevention is far more effective than treatment. Mulch around the base of the plant to prevent soil from splashing onto lower leaves. Water at the base of the plant rather than overhead. Prune the lower foliage to improve air circulation. Rotate where you plant tomatoes so you’re not growing them in the same soil two years running. If blight does appear, remove affected leaves immediately and consider a copper-based fungicide as a protective spray on the remaining healthy foliage. Copper sprays work as a barrier, not a cure, so they only help if applied before the disease reaches the upper canopy.
Late blight, the disease that caused the Irish Potato Famine and remains a serious threat to tomatoes, deserves special mention because it can destroy a plant in days rather than weeks. It thrives in cool, wet weather and produces grayish-green water-soaked spots on leaves and stems. If you see it, remove and bag affected plants entirely; do not compost them. The spores travel on wind and can infect neighboring gardens.
Companion Planting
Interplanting tomatoes with certain herbs and flowers is a time-honored garden practice, and there is some research backing specific combinations. A study on companion planting with tomatoes found that intercropping with fennel reduced fruitworm damage by about 24 percent compared to growing tomatoes alone. The researchers noted that the greatest fruitworm losses occurred in monocrop tomato plots and in plots intercropped with peppermint.
Basil is the most commonly recommended tomato companion, partly for culinary convenience and partly because its flowers attract pollinators and predatory insects. Marigolds are another classic choice; their root exudates are thought to suppress root-knot nematodes over time, which complements the nematode resistance already present in Park’s Whopper. On the other hand, planting tomatoes near brassicas like cabbage and broccoli is generally discouraged because they compete heavily for the same nutrients and can attract pests that jump between the two crop families.
Harvesting at the Right Time
Park’s Whopper fruits are ready to pick when they’re fully colored and give slightly when you press them gently. With beefsteak types, waiting for deep, even color pays off in flavor because sugars and acids continue developing as the fruit ripens on the vine. However, you don’t have to wait until the fruit is perfectly red. Tomatoes harvested at the “breaker” stage, when they’ve just started to turn from green to pink, will finish ripening indoors at room temperature and still taste good.
Research on tomato harvest maturity and storage quality found that fruits picked at full red ripeness scored highest on a comprehensive quality index evaluating sugar content, acidity, lycopene levels, and vitamin C. Tomatoes picked at the color-change stage stored better at cool temperatures (around 37°F), while those picked fully green had the poorest overall quality regardless of storage temperature.
For home growers, the practical takeaway is to leave fruit on the vine as long as your weather and pest pressure allow. Pick at breaker stage if storms, cracking, or fruitworms threaten, and finish ripening on the kitchen counter. Never refrigerate a tomato that hasn’t fully ripened; cold temperatures below about 50°F shut down the enzymes responsible for flavor development and produce the mealy, bland texture most people associate with grocery-store tomatoes. Once fully ripe, a day or two in the fridge is fine if you need to slow things down.
Why Saving Seeds from Park’s Whopper Does Not Work
Because Park’s Whopper is an F1 hybrid, the seeds inside its fruit will not grow into plants identical to the parent. F1 hybrids are created by crossing two specific parent lines, and the resulting seeds carry a scrambled mix of traits from both parents. If you plant them, you’ll get a grab bag of plants: some might resemble the original Whopper, but many will revert toward one parent or the other, producing different fruit sizes, growth habits, and disease resistance levels. The predictable performance that makes the hybrid worth growing in the first place is lost.
If you want the same variety next year, buy fresh seed or starts. If you’re interested in seed saving as a practice, open-pollinated and heirloom beefsteak varieties like Brandywine or Cherokee Purple are better candidates, since their seeds breed true from generation to generation. The trade-off is that most open-pollinated beefsteaks lack the disease-resistance package that hybrids like Park’s Whopper carry, so you’ll need to be more attentive to soil health and disease prevention.
Extending the Season
Park’s Whopper typically needs 70 to 80 days from transplant to first ripe fruit, and it keeps producing until frost. In short-season climates, starting seeds early indoors and using black plastic mulch or row covers to warm the soil before transplanting can buy you a couple of extra weeks on the front end. At the end of the season, draping row cover fabric over the plants on nights when frost is forecast can extend the harvest by another two to three weeks.
If you’re growing in a climate with very hot summers, be aware that tomato pollen becomes less viable when daytime temperatures consistently exceed about 90°F. During heat waves, you may notice flowers dropping without setting fruit. This is normal and temporary. The plant will resume setting fruit once temperatures moderate, so keep watering and feeding through the hot stretch. Shade cloth rated at 30 to 40 percent can help moderate temperatures around the plants during extreme heat, though in most climates simply waiting out the hottest week or two is sufficient.