9 Must-Know Tips for Creating the Best Soil for Tomatoes (2024)

The best harvest starts with providing the best soil for tomatoes. Far from glamorous and usually lacking attention, the soil around tomato roots determines the quality and quantity of the harvest. The juiciest, most flavorful, and brilliantly colored tomatoes rise from soil that is rich in organic matter teeming with nutrients that tomato plants need to thrive, along with a host of hardworking soil microbes that contribute to everything from soil drainage to disease resistance. Create the best soil for tomatoes you possibly can with these nine tips.

1. Add compost for the best soil for tomatoes.

Nutrient-packed compost is the best way to improve any type of garden soil—from heavy clay to fast-draining sand. Compost supplies elements tomato plants need to produce healthy foliage and flavorful fruits. It provides valuable structure to the soil, adding air space and amplifying the soil’s ability to hold moisture. Compost also sustains a multitude of helpful organisms—from beneficial fungi and bacteria to a vibrant earthworm population. In short, compost does more for the flourishing of a tomato plant than any other soil amendment.

2. Get a soil test.

Get a good read on your local soil with a soil test. Available from state extension services and online commercial soil test labs, a good soil test analyzes the nutrient content and pH of the soil. Based on the findings, the test gives a recipe for amending the soil. That way, you don't have to guess what your soil needs. Instead, you'll get specific recommendations for what to add and how much for the best soil for tomatoes.

3. Rotate planting spots.

Tomato diseases, such as early blight, live in the soil and plague plants year after year. To minimize disease infestations, plant tomatoes in a new location every year on a three-year crop rotation plan. Crop rotation is a great way to keep soil-borne diseases in check.

4. Avoid polluted areas.

Some soil is simply not fit for growing tomatoes. For example, soil near black walnut trees isn’t the best soil for tomatoes. Black walnut trees exude a chemical called juglone that is toxic to many plants, including tomatoes. Juglone infiltrates the soil beneath the tree canopy and far beyond the drip line. Don’t grow tomatoes near walnut trees; find another location or grow plants in containers.

5. Use organic mulch.

Mulching the soil around tomato plants helps keep weeds at bay and conserves soil moisture. When organic mulch, such as compost, shredded bark, or weed-free grass clippings, is used, mulch also improves soil structure. The mulch slowly decomposes and mixes into the top layer of soil, adding nutrients and improving structure.

A 2-inch-thick layer of mulch is an excellent addition to the soil around every tomato plant. Wait to apply mulch until the soil is adequately warm in spring; mulch has an insulating power that is helpful in the heat of summer, but warm soil is necessary to spur growth in spring.

6. Consider raised beds.

Raised beds are a terrific way to create the best soil for tomatoes. If your planting place is plagued by polluted soil, boggy clay soil, or excessively sandy soil, build a raised bed and fill it with high-quality topsoil. Many easy-to-assemble raised beds are available for purchase.

7. Cover crops are a good idea.

Cover crops—also called green manure—planted in early spring or fall improve the garden soil’s structure and fertility. The cover crops for tomatoes are grown until the plants begin to flower, at which time they are cut down and incorporated into the soil. Great cover crops for tomatoes include winter rye, annual ryegrass, and winter wheat.

8. Skip weed-free fertilizer.

When fertilizing tomatoes, read product labels carefully. Fertilizer containing weed-killer is a popular product but is not welcome near tomatoes. The weed-killer portion of the product infiltrates the soil and harms or kills young, tender tomato plants.

9. Don't neglect clean up.

At the end of the tomato growing season, remove any diseased tomato plant parts. Bury or burn the diseased stems and leaves; don't add them to a compost pile. After removing diseased plants, chop the remaining plant parts with a mower set on the highest mowing height and leave the debris in the garden to nourish the ground for the best soil for tomatoes.

Tomato Care for the Tastiest Crop

Once you've planted your tomatoes, you'll want to care for them so they thrive and produce a beautiful crop you can enjoy in salads, sauces, and more. If you spot yellow leaves on your tomato plants, you may have pests that need to be eliminated or some other environmental problem, so here are tips for eradicating them. You want to avoid overwatering or underwatering for the best fruit. Do your tomatoes have an odd shape? That could be catfacing, and there are ways to prevent it. Rot is one of the biggest culprits in ruining tomato plants, but you can avoid it if you follow these steps.