Choose a spot with at least six to eight hours of direct sunlight daily
Tomatoes need sun more than almost any other garden vegetable. A location that gets six hours of direct sun will produce fruit, but eight or more hours gives you sweeter, more abundant tomatoes. Morning sun is especially valuable because it dries dew from the leaves, which reduces disease.
If your yard has both sunny and partly shaded spots, pick the sunniest one even if it means moving other plants. Tomatoes grown in shade produce fewer flowers and fruit, and the fruit ripens more slowly. In very hot climates (above 95°F regularly), afternoon shade from a tree or shade cloth can prevent sunscald on the fruit, but this is the exception.
Check your spot at different times of day before planting. A location that looks sunny at 9 a.m. might be shaded by a building or tree by afternoon. Observe the same spot for a few days if you can.
Key Takeaways
- Plant tomatoes where they receive at least six to eight hours of direct sunlight each day, with morning sun preferred to reduce leaf disease.
- Soil should drain well and be rich in organic matter; tomatoes rot if water pools around the roots after rain.
- Space plants two to three feet apart to allow air to move between them and prevent fungal disease.
- Containers work well for tomatoes if they are at least five gallons and have drainage holes in the bottom.
- Avoid planting tomatoes in the same spot year after year, as soil-borne diseases build up over time.
Prepare soil that drains well and holds nutrients
Tomatoes prefer soil that is loose, rich, and drains quickly. Before planting, work compost or aged manure into the top eight to ten inches of soil. This improves drainage in clay soil and helps sandy soil hold water and nutrients longer.
Test your drainage by digging a hole about six inches deep, filling it with water, and watching how fast it drains. If water is still sitting after four hours, the soil drains too slowly. In that case, either build a raised bed filled with better soil, or plant in a large container instead of the ground.
Tomatoes are heavy feeders and will deplete soil nutrients over a season. Adding compost before planting gives them a good start. You can also mix in a balanced fertilizer (such as 5-5-5 or 10-10-10) according to package directions, though compost alone often provides enough nutrition for the first month.
Space plants far enough apart for air circulation
Plant tomatoes two to three feet apart, depending on the variety. Determinate (bush) tomatoes can be closer—about two feet. Indeterminate (vining) tomatoes need three feet or more because they grow larger and bushier.
Crowding tomatoes together traps moisture between leaves and stems, which creates conditions for fungal diseases like early blight and powdery mildew. Good air flow dries the foliage quickly after rain or watering. If you have limited space, choose determinate varieties or grow tomatoes in containers where you can space them farther apart.
Rows should also be spaced far enough apart that you can walk between them and reach the plants without brushing against wet leaves. A path of at least two feet between rows is practical for maintenance and harvesting.
Use containers if you lack garden space or have poor soil
A container at least five gallons in size will hold one tomato plant. Ten-gallon containers are better because they hold more soil and dry out less quickly. Make sure the container has drainage holes in the bottom—if it does not, drill several holes yourself before filling it with soil.
Fill the container with potting mix (not garden soil, which compacts in containers). Potting mix drains well and is lighter to move. You can place containers on a patio, deck, or balcony as long as they receive six to eight hours of direct sun. Containers warm up faster in spring, so you can plant earlier than you would in the ground.
Containers dry out faster than ground soil, especially on hot days. Check the soil moisture daily during the growing season and water when the top inch feels dry. In peak summer heat, you may need to water every day.
Rotate planting locations each year to prevent disease buildup
Tomato diseases like early blight, late blight, and fusarium wilt live in soil and plant debris. If you plant tomatoes in the same spot year after year, these diseases accumulate and become harder to manage. Move your tomato bed to a different location each season, or at least every other year.
A straightforward rotation is to divide your garden into three or four sections and plant tomatoes in a different section each year. If you use containers, you can refill them with fresh potting mix each spring, which eliminates this concern. Do not reuse old potting mix from a container where a diseased tomato grew without sterilizing it first.
Also remove all tomato plants and debris from the garden at the end of the season. Do not leave dead plants or fallen fruit on the ground, as disease spores survive the winter in this material.
Protect plants from wind and provide support structures
Strong wind can break stems, damage flowers, and stress plants. If your garden is in a windy location, plant tomatoes on the sheltered side of a fence, wall, or hedge. You can also install a windbreak using stakes and burlap or shade cloth.
Most tomato varieties need support as they grow. Install stakes, cages, or trellises at planting time rather than later, when you risk damaging roots. Determinate varieties need a sturdy cage or two stakes. Indeterminate varieties grow tall and need a stake at least six feet tall or a trellis system. Tying plants to supports keeps fruit off the ground where it can rot or be eaten by slugs and other pests.
Avoid planting near other nightshade crops
Tomatoes belong to the nightshade family, along with peppers, eggplants, and potatoes. These plants share similar pests and diseases. Planting them close together or in the same spot year after year concentrates these problems. If possible, plant tomatoes at least three to four feet away from peppers or eggplants, and rotate them to a different area from where you grew potatoes the previous year.
This does not mean you cannot grow these crops together—many gardeners do successfully. It straightforward means spacing them well and rotating locations reduces pest and disease pressure over time.
Frequently Asked Questions
Can I plant tomatoes in partial shade?
Tomatoes will grow in four to six hours of sun, but they produce fewer flowers and fruit, and ripening takes longer. Six to eight hours is the practical minimum for a good harvest. If your only option is partial shade, choose a spot with morning sun rather than afternoon shade.
What if my soil is very acidic or alkaline?
Tomatoes prefer soil with a pH between 6.0 and 6.8. If your soil is very acidic (below 6.0), add lime according to a soil test result. If it is very alkaline (above 7.5), add sulfur. A soil test from your local extension office tells you exactly how much to add. You can also grow tomatoes in containers with potting mix, which gives you control over soil conditions.
How deep should I dig when planting a tomato?
Bury the tomato stem deeper than it was growing in its pot—up to the first true leaves. Tomatoes develop roots all along the buried stem, which creates a stronger root system. This is one of the few times deeper planting is better for a vegetable.
Can I plant tomatoes in the same container year after year?
You can, but refresh the potting mix each spring. Old mix becomes compacted and depleted of nutrients. Remove the old mix, rinse the container, and fill it with fresh potting mix before planting. This prevents disease carryover and gives new plants better growing conditions.
What is the best time of year to plant tomatoes?
Plant tomatoes after the last frost date in your area, when soil has warmed to at least 60°F. Tomatoes are warm-season plants and will not grow well in cold soil. Your local extension office or a gardening calendar for your region tells you the safe planting window.