The basics: soil, sun, and water are what separate good tomatoes from mediocre ones

Good tomatoes start with three things you control: rich soil, at least six to eight hours of direct sun each day, and consistent watering. Most home gardeners grow bland tomatoes because they skip one of these. Tomatoes grown in poor soil or shade will be watery and flavorless no matter what variety you plant. The plant needs deep, well-draining soil with organic matter mixed in—compost, aged manure, or peat moss work well. When you plant, bury the stem deeper than it was in the pot; tomatoes will root along the buried stem and develop a stronger plant.

Water deeply and regularly, aiming for about one to two inches per week depending on heat and rainfall. Water at the soil level in the morning, not from above and not in the evening—wet foliage invites disease. Inconsistent watering causes problems like blossom-end rot (a dark sunken spot on the bottom of the fruit) and fruit that cracks when rain comes after a dry spell. A drip line or soaker hose is worth the small investment because it delivers water where the roots need it and keeps leaves dry.

Key Takeaways

  • Plant tomatoes in soil enriched with compost or aged manure, bury the stem deeper than the pot depth, and choose a spot with six to eight hours of direct sun daily.
  • Water at soil level in the morning, aiming for one to two inches per week, and avoid wetting the leaves to prevent fungal disease.
  • Prune suckers (shoots that grow between the main stem and branches) on indeterminate varieties to direct energy into fruit rather than foliage.
  • Harvest tomatoes when they are fully colored but still slightly firm; they will continue to ripen off the vine and taste better than hard green ones picked early.
  • Choose disease-resistant varieties labeled with letters like V, F, or N if your area has a history of specific tomato diseases.

Choosing a variety that grows well in your climate

The variety you plant matters as much as how you grow it. Determinate tomatoes (bush types) grow to a fixed size, produce most of their fruit at once, and work well for canning or sauce. Indeterminate tomatoes (vining types) grow taller, produce fruit throughout the season, and are better for fresh eating. Check your seed packet or nursery label for the days to maturity—this tells you how many days from transplant to first ripe fruit. If your growing season is short, choose varieties that mature in 60 to 70 days rather than 85 to 90.

Look for disease resistance codes on the label. The letters V, F, N, T, and A indicate resistance to common tomato diseases: Verticillium wilt, Fusarium wilt, nematodes, tobacco mosaic virus, and alternaria leaf spot. If your area has had problems with any of these, choosing a resistant variety saves you from fighting disease all season. Popular reliable varieties include 'Brandywine' for flavor (though it is disease-prone), 'San Marzano' for sauce, 'Cherokee Purple' for rich taste, and 'Early Girl' for speed in cool climates.

Pruning and supporting the plant as it grows

Indeterminate tomatoes need support—a cage, stake, or string system—to keep fruit off the ground and improve air circulation. Install support at planting time rather than later, when you risk damaging roots. As the plant grows, remove suckers, which are shoots that sprout between the main stem and the branches. Suckers don't produce fruit; they just steal energy and create dense foliage that traps moisture and invites disease. Pinch them off by hand when they are small, or cut them with pruning shears. Determinate bush types need less pruning, but removing a few lower leaves once fruit sets improves air flow around the base.

Once the plant is flowering and setting fruit, stop pruning heavily. Heavy pruning late in the season removes leaves the plant needs to ripen fruit. In very hot climates, a little shade cloth (30 to 50 percent shade) in mid-summer prevents sunscald—white or yellow patches on the fruit from sun exposure. In cool climates, remove lower leaves once fruit is visible to direct energy upward and reduce disease pressure from soil splash.

Feeding the plant without overdoing nitrogen

Tomatoes are heavy feeders, but too much nitrogen produces leafy plants with few tomatoes. Mix a balanced fertilizer (like 5-10-10) into the soil at planting, or use compost as your primary nutrient source. Once flowering begins, switch to a fertilizer higher in phosphorus and potassium (the second and third numbers), which promote fruiting rather than leaf growth. Tomato-specific fertilizers are formulated this way. explore fertilizer every two to three weeks according to the package directions, or use a slow-release granule at planting that feeds over the whole season.

If leaves turn yellow and the plant looks weak, it may need nitrogen. If the plant is dark green and bushy but producing few flowers, it has too much nitrogen. Consistent feeding matters less than consistent watering—a plant that is stressed by dry soil cannot use nutrients efficiently no matter how much you feed it.

Recognizing and preventing common diseases

The three most common tomato diseases are early blight, late blight, and powdery mildew. Early blight appears as brown spots with concentric rings on lower leaves, usually in mid-summer. Remove affected leaves and improve air circulation by pruning. Late blight causes water-soaked spots on leaves and fruit and spreads fast in cool, wet weather—it is the disease that caused the Irish potato famine. If you see it, remove the entire plant to prevent spread. Powdery mildew looks like white powder on leaves and is less serious but still reduces yield.

Prevention is easier than treatment. Water at soil level, not overhead. Space plants far enough apart that air moves between them. Remove lower leaves once fruit sets. Mulch around the base to prevent soil splash. If disease appears, remove affected leaves when ready and dispose of them in the trash, not the compost pile. Fungicide sprays (sulfur or copper-based) work best as prevention, applied before disease appears, rather than as a cure. Choosing resistant varieties is your best defense.

Harvesting at the right stage for best flavor

Tomatoes picked fully ripe on the vine taste better than those picked green and ripened indoors, but they are also softer and harder to ship. For home growing, wait until the tomato is fully colored—red, pink, orange, or yellow depending on variety—and yields slightly to gentle pressure. The fruit should feel heavy for its size. Tomatoes continue to ripen for a few days after picking if kept at room temperature, so picking them at the "breaker stage" (when color is just starting to show) is fine if you need to harvest before a frost or disease pressure gets worse.

In late summer, when frost is coming and many tomatoes are still green, pick all fruit and ripen them indoors. Place them in a cardboard box or paper bag at room temperature, away from direct sun. They will ripen over one to three weeks. Do not refrigerate tomatoes until they are fully ripe; cold temperatures below 55°F damage the flavor compounds and make the texture mealy. Once ripe, tomatoes keep in the refrigerator for a few days, though flavor is best at room temperature.

Frequently Asked Questions

Why are my tomatoes cracking or splitting?

Cracking happens when the fruit absorbs water unevenly—usually after a dry period followed by heavy rain or watering. Consistent soil moisture prevents this. Mulch around the base to regulate moisture, and water deeply and regularly rather than in sporadic heavy doses. Some varieties crack more easily than others; 'San Marzano' and 'Paste' types are more resistant than large slicing types.

Can I grow tomatoes in a pot?

Yes, but the pot must be large—at least five gallons for determinate types and ten gallons for indeterminate. Use quality potting soil, not garden soil, which compacts in a container. Potted tomatoes dry out faster, so check soil moisture daily and water more often than in-ground plants. Determinate varieties and smaller varieties like cherry tomatoes do better in pots than large slicing types.

What causes blossom-end rot on the bottom of the fruit?

Blossom-end rot is a calcium deficiency caused by inconsistent watering, not a lack of calcium in the soil. The plant cannot move calcium to the fruit when soil moisture fluctuates. Water deeply and regularly, and mulch to keep soil moisture even. Once rot appears on a fruit, that fruit cannot be saved, but consistent watering will prevent it on new fruit.

Should I remove leaves to help tomatoes ripen faster?

Removing a few lower leaves improves air circulation and disease prevention, but heavy leaf removal slows ripening because the plant needs leaves to photosynthesize and produce the sugars that make tomatoes sweet. Remove only diseased or damaged leaves and the lowest leaves once fruit is visible. Do not strip the plant bare.

Why do my tomatoes taste bland even though they look ripe?

Bland tomatoes usually come from too much shade, inconsistent watering, or poor soil. Tomatoes need six to eight hours of direct sun and rich soil with organic matter to develop flavor. Watering inconsistently also dilutes flavor. Some varieties are naturally milder than others—heirloom and paste varieties tend to be more flavorful than modern hybrids bred for shipping durability.