How to Grow Greenhouse Vegetables: An Organic Approach

Posted on Categories:"How To Grow", Edible Plant Growing Information
How to Grow Greenhouse Vegetables

Nurturing a Bounty: The Art of Growing Organic Vegetables in a Greenhouse

Greenhouse vegetable growing offers a unique opportunity for year-round cultivation, especially when approached organically. In a controlled environment, you can grow a variety of vegetables, irrespective of the external weather conditions. This guide focuses on organic practices in greenhouse vegetable gardening, emphasizing sustainable methods and the specific needs of different vegetables.

1. The Benefits of Growing Greenhouse Vegetables

Greenhouse gardening allows for extended growing seasons and better control over the growing environment. By protecting plants from harsh weather and pests, greenhouses enable gardeners to grow vegetables that might otherwise be impossible in their climate. The controlled environment also means a reduction in the use of chemical pesticides and fertilizers, aligning well with organic gardening principles.

2. Tomatoes: A Greenhouse Favorite

Tomatoes are a popular choice for greenhouse cultivation. From planting to harvest, tomatoes usually require about 60-80 days. Indeterminate varieties can grow up to 6 feet or more, requiring staking or trellising. Organic compost and regular watering are crucial for their growth, and they thrive in temperatures between 55°F and 85°F.

3. Bell Peppers: Colorful and Versatile

Bell peppers can be successfully grown in greenhouses, maturing in about 60-90 days. These plants can grow up to 3 feet tall and prefer warmer temperatures, ideally between 70°F and 80°F. Organic soil rich in phosphorus and potassium, along with consistent moisture, is key to their development.

4. Lettuce: A Cool-Weather Crop

Lettuce is ideal for cooler greenhouse environments. Most varieties mature within 45-55 days and grow to about 6-12 inches tall. Lettuce prefers temperatures between 45°F and 65°F and requires moist, fertile soil with good drainage. It’s a great choice for year-round production in a greenhouse.

5. Cucumbers: Fast-Growing Vines

Greenhouse cucumbers can be harvested as early as 50-70 days after planting. They are fast-growing vines, often reaching lengths of 6-8 feet, and require vertical space or trellising. Warm temperatures (around 70°F) and high humidity are ideal. Organic gardeners should ensure ample pollination for fruit development, which may require manual intervention in a greenhouse.

6. Herbs: Aromatic and Compact

Herbs like basil, parsley, and cilantro are excellent choices for greenhouse cultivation. They generally require 30-40 days to harvest and remain relatively small, making them suitable for even compact greenhouses. Herbs prefer temperatures between 65°F and 70°F and need well-draining soil.

7. Managing Greenhouse Pests and Diseases

Organic pest control in a greenhouse includes introducing beneficial insects, using insecticidal soaps, and practicing crop rotation. Regular inspection and maintaining a clean environment help prevent the spread of diseases. Adequate ventilation is crucial to avoid damp conditions that can lead to fungal diseases.

8. Watering and Humidity Control

Consistent watering is crucial in a greenhouse, as plants don’t have access to natural rainfall. Drip irrigation systems are effective for maintaining consistent soil moisture. Managing humidity is also essential to prevent disease; this can be achieved through proper ventilation and spacing of plants.

9. The Importance of Soil Health

In organic greenhouse gardening, soil health is paramount. Regularly adding organic matter and ensuring balanced nutrient levels are vital for healthy plant growth. Compost, worm castings, and organic fertilizers can be used to enrich the soil without resorting to chemical inputs.

10. Maximizing Space and Crop Rotation

To make the most of the limited space in a greenhouse, consider vertical gardening and intercropping. Crop rotation is equally important in a greenhouse setting to prevent soil-borne diseases and nutrient depletion. Rotating different vegetable families helps maintain a healthy soil environment.


Organic greenhouse vegetable growing is a rewarding endeavor that yields fresh produce throughout the year. By understanding the specific needs of different vegetables and adhering to organic principles, you can create a sustainable and productive greenhouse garden. With careful planning, pest management, and soil care, your greenhouse can be a source of bountiful, healthy vegetables for your table, regardless of the season outside.