How to Grow Indoor Tomatoes for Year-Round Harvests

Overview

No outdoor space? Grow juicy, vine-ripened tomatoes indoors. They need long sunny days and warmth—best in summer, but possible in winter with warm spot and supplemental light. More work than garden tomatoes, but far superior to store-bought.

Indoor Growing Steps

Step 1: Choose Variety

Small-fruited types (cherry, grape) do best in containers. Sun Gold, Patio, Tommy Toe are good. Buy seeds/transplants in spring/summer. For winter, buy seeds in summer (may be unavailable in fall).

Step 2: Start Seeds

Use small containers with pre-moistened potting mix. Peat pots or yogurt tubs with drainage holes work.

Step 3: Plant Seeds

Bury ¼ inch deep.

Step 4: Provide Light

South-facing window. If <8–12 hours sun, supplement with grow light or bright fluorescent.

Step 5: Water Consistently

Keep soil evenly moist.

Step 6: Transplant Up

At 4–6 inches tall, move to 5-gallon container. Use 3–4 parts potting mix to 1 part compost. Grow 1–3 plants per container.

Step 7: Support Plants

Install tomato cage or stakes.

Step 8: Rotate for Even Growth

Rotate pots weekly for uniform light and straight growth.

Step 9: Fertilize

Feed with fish emulsion 2–3 times per season. Follow package directions.

Step 10: Pollinate

Tap vines when watering, or use electric fan on plants.

Step 11: Harvest

Pick when richly colored, heavy for size, and releases easily.