Greenhouse and compost: the game-changing tip!

By the AtmoSerre Team

Discover how to use compost to transform your greenhouse, maximize your harvests, and nourish your plants 100% naturally. This article is packed with practical tips, little-known tricks, and mistakes to avoid, so your greenhouse can become a truly productive haven.

Why compost is essential in a greenhouse

Compost is much more than a simple fertilizer. It allows for:

  • Improving soil structure: compost-rich soil retains water and nutrients better.

  • Providing all essential nutrients: nitrogen, phosphorus, potassium, and trace elements.

  • Stimulating microbial life: beneficial bacteria and fungi strengthen roots and protect your plants.

  • Reducing household waste: your peelings and lawn clippings become a real treasure for your crops.

Little-known tip: mix mature compost and greenhouse soil in a 1:3 ratio to enrich the soil without "burning" young roots.

The 5 common mistakes with compost in a greenhouse

1. Using immature or "green" compost

Unripe compost can burn roots or unbalance fertility.
Tip: ensure the compost smells like damp earth, not ammonia or fermenting peelings.

2. Applying too much

Excess compost can lead to too much nitrogen, causing excessive leaf growth at the expense of fruit.
Tip: a 2 to 3 cm layer is enough to nourish your crops.

3. Not varying materials

Compost made only from green waste = too rich in nitrogen. Compost made only from dead leaves = too poor.
Tip: alternate green and brown materials for balanced compost.

4. Forgetting it during winter

Even in a greenhouse during winter, your plants continue to benefit from living soil.
Tip: add a thin layer of compost to raised beds or garden beds; your hardy vegetables will thrive on it.

5. Not integrating it properly into the soil

Adding compost to the surface without mixing it limits its effectiveness.
Tip: lightly mix it with the existing substrate or soil to promote microbial activity.

How to use compost effectively in your greenhouse

1. Base fertilization

  • Before sowing, incorporate a layer of mature compost into the soil.

  • Ideal for nutrient-hungry vegetables like tomatoes, peppers, and zucchini.

2. Nutritious mulching

  • Spread 1 to 2 cm of compost around established plants.

  • Retains moisture, limits weeds, and gradually nourishes.

3. Mixing with potting soil or substrate

  • For your seedlings, mix 20 to 30% compost with your potting soil to boost young plants.

4. Liquid compost (compost tea)

  • Steep mature compost in water for 24-48 hours and water your plants.

  • Provides immediately absorbable nutrients and stimulates microbial life.

Little-known tip: add a little nettle manure to your compost tea to enhance its fertilizing effect and repel certain pests.

Plants that love compost in a greenhouse

Certain crops particularly benefit from regular compost application:

  • Tomatoes and peppers: faster growth, more flavorful fruits.

  • Lettuce and spinach: greener and more tender leaves.

  • Strawberries: better flowering and higher yield.

  • Aromatic herbs: basil, parsley, and chives thrive in rich soil for rapid growth.

Little-known tip: for fruit vegetables, use compost as mulch and then water with a little compost tea to double the nutritional effect.

Accessories that maximize the effect of compost in a greenhouse

To get the most out of your compost:

Conclusion – Transform your greenhouse with compost

Compost is a powerful tool for healthy, productive, and resistant plants. By avoiding common mistakes and integrating it correctly, you will:

  • Improve soil fertility

  • Limit diseases

  • Maximize your harvests all year round

Discover our accessories and solutions for greenhouses, garden beds, and composters to transform your greenhouse into a true productive mini-garden. 

Also discover our greenhouses designed to adapt to your garden and all seasons, conceived to create an ideal environment and transform your space into a true productive garden all year round.