Plant your tomato in the ground after the last frost date, in a spot that gets at least six to eight hours of direct sun each day

Tomatoes need warmth and light to grow well, so timing and location matter more than anything else. The last frost date for your area is the day after which frost will not return — check your local extension office or search online for your zip code. Plant anytime after that date through midsummer. Choose a spot in your yard where the sun hits the ground for most of the day; if you have a choice between morning sun and afternoon sun, morning is better because it dries dew and reduces disease.

Before you dig, gather what you will need: a tomato plant from a nursery (one that is 6 to 12 inches tall), a shovel or spade, compost or aged manure, a cage or stake for support, and water. If your soil is clay or sandy, adding compost will help it hold moisture and nutrients. You do not need expensive soil amendments — a few inches of compost mixed into the planting hole is enough.

Key Takeaways

  • Plant after your area's last frost date in a spot that receives at least six to eight hours of direct sun daily.
  • Dig a hole deeper than the root ball and bury the stem up to the first true leaves, because tomatoes will grow roots along the buried stem.
  • Space plants 24 to 36 inches apart so air can move between them and reduce disease.
  • Water deeply at the base of the plant right after planting and keep the soil consistently moist but not waterlogged for the first two weeks.
  • Install a cage or stake at planting time rather than later, so you do not damage roots when the plant is larger.

Dig the hole and prepare the soil

Dig a hole that is wider and deeper than the root ball of your tomato plant. A hole 12 inches wide and 12 inches deep is a good starting point for a young plant. The depth matters because tomatoes have a special ability: if you bury part of the stem underground, that buried stem will grow roots. This gives the plant a stronger root system and helps it survive dry spells.

Mix compost or aged manure into the soil you removed from the hole — use about one part compost to two parts soil. If your soil is very heavy clay, add more compost. If it is very sandy, add compost and also mix in a handful of peat moss or coconut coir to help it hold water. Pour this mixture back into the hole until it is about half full.

Plant the tomato at the right depth

Remove the tomato plant from its nursery pot and gently loosen the roots with your fingers. If the roots are tightly wound in a circle, make three or four shallow cuts down the sides of the root ball to encourage them to spread outward into the soil.

Set the plant in the hole so that the soil line on the stem — the place where the stem color changes from lighter to darker — is at or slightly below ground level. You can bury the stem deeper than it was in the pot; bury it up to the first set of true leaves if the stem is tall and leggy. The buried portion will develop roots. Fill the hole with your soil-compost mixture, pressing gently as you go to remove air pockets. The soil should be firm but not compacted.

Space plants far enough apart for air circulation

If you are planting more than one tomato, space them 24 to 36 inches apart. The exact distance depends on the variety — determinate types (bush tomatoes) can be closer, around 24 inches, while indeterminate types (vining tomatoes) need 30 to 36 inches. Crowded plants trap moisture between leaves and create conditions where fungal diseases like early blight and powdery mildew spread quickly.

Check the plant tag or seed packet for the mature size of your variety. If it says the plant will be 4 feet tall and wide, give it more space. If it says 2 feet, 24 inches between plants is fine. Air movement is your goal — you should be able to see light between the plants once they are full-sized.

Install support before watering

Push a cage or stake into the ground right next to the plant, before you water. If you wait until the plant is larger, you risk driving the stake through roots. A tomato cage should be at least 5 feet tall for indeterminate varieties; many store-bought cages are too short and the plant will grow out the top. A single stake works well too — use a 6-foot stake and tie the main stem to it loosely with cloth strips or soft twine as the plant grows.

Do not tie the stem tightly; leave a little slack so the stem can expand. Tie in a figure-eight pattern — one loop around the stake, then one around the stem — so the stake does not cut into the plant as it thickens.

Water deeply and keep the soil moist

Water the plant thoroughly right after planting, pouring water slowly at the base until it soaks in. The soil should be wet to a depth of 6 to 8 inches. For the first two weeks, water every two to three days if there is no rain, keeping the soil consistently moist but not soggy. Soggy soil invites root rot; moist soil is what you want.

After the first two weeks, when the plant is established, water less often but more deeply. Tomatoes prefer deep, infrequent watering to frequent shallow watering. Water at the base of the plant, not on the leaves, to keep foliage dry and reduce disease. In hot weather, a mature plant may need water every two to three days; in cool weather, once a week may be enough. Stick your finger into the soil 2 inches deep — if it feels dry, water.

Protect young plants from wind and pests

If you plant in spring when the weather is still unpredictable, a young tomato can be damaged by wind or a late cold snap. If frost is forecast after you plant, cover the plant with a cloth or frost blanket overnight and remove it in the morning. If strong winds are common in your area, stake the plant even if you plan to use a cage later — the stake will stabilize it while it is small.

Watch for cutworms, which sever seedlings at soil level. If you see a plant that was upright yesterday now lying on its side with the stem cut, a cutworm is at work. Wrap a collar of stiff paper or cardboard around the base of the stem, pushing it 1 inch into the soil and leaving 2 inches above ground. This barrier stops the cutworm from reaching the stem.

Frequently Asked Questions

Can I plant a tomato that is already flowering?

Yes, but pinch off the flowers before planting. The plant will put energy into growing roots instead of fruit, and a stronger root system means more tomatoes later. Once the plant is established in the ground — after two to three weeks — it will flower again and set fruit.

What if my soil is very poor or I have no compost?

Buy a bag of compost or composted manure from a garden center and mix it into the planting hole. You do not need much — even 2 to 3 inches of compost mixed into the top 8 inches of soil will help. If you cannot get compost, a balanced fertilizer like 10-10-10 mixed into the soil at planting time will work, though compost is better because it also improves soil structure.

How long before I see fruit?

Most tomato varieties flower within four to six weeks of planting and set fruit two to three weeks after that. From flower to ripe tomato is usually another four to six weeks, so expect your first ripe tomato about three months after planting. Early varieties are faster; large beefsteak types take longer.

Can I plant in a pot instead of the ground?

Yes, but use a pot at least 5 gallons for determinate varieties and 10 gallons for indeterminate types. Pots dry out faster than ground soil, so you will water more often. Otherwise, the planting steps are the same — bury the stem deep, use good potting soil, and install support right away.

What if the plant looks wilted after I plant it?

Wilting in the first day or two is normal transplant shock. Water it well and leave it alone for a few days. If it stays wilted after a week and the soil is moist, the roots may have been damaged or the plant may have a disease. If the soil is dry, water deeply. Most plants recover within a week if the soil is right and the sun is not too intense — shade cloth for a few days can help a stressed plant.