Soil Mix and Drainage for Container Tomatoes in Shallow Boxes

10‑Inch Deep Boxes? Choose Patio Varieties or Modify.

Standard tomatoes need 18‑24″ of root depth. In 10″ boxes, either:

• Grow determinate patio/bush tomatoes (e.g., 'Patio Choice', 'Tiny Tim', 'Bush Early Girl').
• Cut out the box bottoms so roots reach native soil.

Recommended Soil Mix

Equal parts: high‑quality potting mix, compost, and perlite/pumice. Add 1 cup slow‑release tomato fertilizer per 10‑gal volume.

Drainage Essentials

• Drill ½″ holes every 6″ along box bottom.
• Line with landscape fabric (not plastic) to keep soil in.
• Do NOT add a gravel layer—it creates a perched water table.

Mulch & Water

Mulch 2″ with straw. Water daily in heat; never let soil dry completely. Feed with liquid tomato fertilizer weekly after fruit set.

With patio varieties and excellent drainage, shallow boxes can produce a decent crop.