Organic Tomatillo Cultivation: Soil, Companions, and Greenhouse Tips

Tomatillo Basics

Tomatillos (Physalis philadelphica) are heat-loving, prolific producers related to tomatoes. They thrive in warm soil, full sun, and well-drained, fertile beds.

Soil Preparation

• Amend beds with 2–3 inches of compost and a balanced organic fertilizer.
• Ideal pH: 6.0–7.0.
• Raised beds improve drainage and warm faster in spring.

Greenhouse Considerations

In cooler climates, a greenhouse extends the season. Use supplemental halide lighting in low-light months. Ventilate to prevent overheating and fungal diseases. Drip irrigation keeps foliage dry.

Companion Planting

• Beneficial: Basil, marigold, nasturtium, carrots, onions.
• Avoid: Fennel, kohlrabi, potatoes.

Fertilization and Watering

• Side-dress with compost or aged manure at flowering.
• Apply liquid kelp or fish emulsion every 2–3 weeks.
• Water deeply 1–2 inches per week; mulch to conserve moisture.

Resources for Deeper Study

• ATTRA Greenhouse Vegetable Production: attra.org
• Permaculture networks: permaearth.org, earthactivisttraining.org