How to Grow Tomatoes

Soil requirements

• A 12–18 inch rooting depth is a practical target in a closed bed. Open-bottom beds can be shallower if native soil below is decent.
• Compost-rich mix is better than a heavy nitrogen dump at transplant. Too much nitrogen makes vines and few flowers.
• If blossom-end rot shows up, look at watering consistency and soil calcium before assuming you need a foliar spray. A soil test is more informative than adding random lime.

Watering

• Keep moisture even once fruit sets. Wild swings are a common factor in cracking and blossom-end rot.
• Water the soil, not the leaves. Soaker hose or drip under mulch is easier than overhead spray.
• Check 2 inches down with a finger. Crop type, heat, wind, and humidity change how fast a bed dries — there is no honest weekly gallon formula.

Sunlight

Full sun is the default. In the hottest US summers, a bit of late-afternoon shade can reduce sunscald on exposed fruit. Do not plant on the north side of a tall trellis that steals morning light.

Planting

• Transplant after nights stay reliably above the low 50s °F and soil has warmed. Cold, wet soil stalls plants.
• Strip the lower leaves and bury most of the stem. Tomatoes grow roots along the buried stem.
• Set the support the same day. Wrestling a cage over a 3-foot plant damages branches.

Spacing

• Determinate / bush: 18–24 inches.
• Indeterminate with cages and little pruning: 30–36 inches.
• Indeterminate pruned to one or two stems: 18–24 inches, with weekly sucker removal.
• Square-foot: 1 plant per square for determinates; 1 per two squares is more realistic for vigorous indeterminates.

Common problems

• Blossom-end rot

  Dark leathery patch on the blossom end. Often tied to uneven water and calcium uptake, not a one-time “add calcium” fix. Mulch and steady irrigation first.

• Early blight / leaf spots

  Lower leaves yellow with spots in humid weather. Improve airflow, avoid wetting foliage, and do not crowd plants. Remove badly affected leaves; do not compost obviously diseased material if your pile stays cold.

• Hornworms

  Missing leaves and dark droppings. Hand-pick. If you see wasp cocoons on a worm, leave that one — the wasps are already working.

• Cracking

  Often follows a rain after a dry spell. Even water and varieties listed as crack-resistant help; they do not make fruit waterproof.

Helpful tools

• Stakes, twine, or a stout cage
• Bypass pruners for suckers and harvest
• Mulch and a soaker hose

Product links will be added when independently researched. See the garden tools hub for buying criteria.

Support systems

Flimsy wire cones sold as tomato cages are undersized for most indeterminate varieties. Use a cage you can barely wrap your hands around, a Florida weave between stakes, or twine from an overhead bar. Pick one system and install it at planting.

Feeding without overdoing it

If the bed was filled with a compost blend, skip a heavy fertilizer at transplant. Side-dress when the first fruit sets if plants look pale or growth stalls. Calculate amounts for your square footage instead of pouring from the bag.

• Use the fertilizer calculator: pick tomatoes, then shop for a bag where potassium keeps up with nitrogen.
• Follow the label if it conflicts with a generic target rate.