Tips for Growing Healthy Greenhouse Fig Trees

Welcome to the world of greenhouse fig trees, where the lush foliage and sweet fruits are not just a treat for the senses but a testament to the meticulous care they receive. If you’re looking to grow healthy fig trees in your greenhouse, you’ve come to the right place.


Here are some fast tips you can take note of:

  • Soil Mix: Use a well-draining soil mix with compost to provide nutrients.
  • Temperature: Maintain a steady temperature of around 78°F for optimal growth.
  • Watering: Implement a consistent watering schedule, avoiding overwatering and under-watering.
  • Pruning: Prune your fig trees to promote health, shape, and productivity.
  • Pest Management: Regularly inspect for pests and diseases and use organic treatments when possible.

Fertile Foundations: Soil Requirements for Greenhouse Fig Trees

Let’s dig into the foundation of any thriving plant: the soil. Your fig tree’s success starts here. The right soil mix not only provides support but also nourishment and aeration. For greenhouse fig trees, you want a soil mix that is rich, well-draining, and packed with organic matter.

Picking the Perfect Soil Mix

A winning soil mix for greenhouse fig trees includes equal parts of loam, peat, and perlite. This combination ensures that your fig trees have the perfect balance of moisture retention and drainage. The loam provides a stable structure, the peat retains moisture and adds acidity, and the perlite ensures excess water drains away quickly.

Example: Imagine combining a bucket of loam, a bucket of peat, and a bucket of perlite. You’d mix them thoroughly to create a uniform, fluffy, and nutrient-rich soil that your fig trees will thrive in.

pH Levels and Nutrient Balance

The pH level of your soil is like the personality of your greenhouse environment—it dictates how your fig tree will grow. Fig trees prefer a slightly acidic to neutral pH, between 6.0 and 7.0. This range allows the tree to absorb the maximum amount of nutrients. You can easily test the soil pH with a home testing kit.

Ensuring a nutrient balance is crucial. Your fig trees will need a good mix of nitrogen, phosphorus, and potassium, along with a host of micronutrients. Incorporating compost or well-rotted manure can boost the soil’s fertility and structure.

Drainage and Water Retention

The key to water management is balance. Your soil should hold moisture long enough to hydrate the roots but drain well enough to prevent waterlogging. If the water sits at the bottom of the pot, it’s a sign of poor drainage, and you may need to adjust your soil mix or improve the container’s drainage holes.

Creating the Ideal Greenhouse Climate

Now, let’s turn up the heat—figuratively speaking. Figs are sun-loving plants, and the greenhouse environment allows you to control their climate to perfection.

Setting the Right Temperature

Temperature control is critical. The sweet spot for fig trees is around 78°F. This warmth encourages active growth and fruit development. During the colder months, use a greenhouse heater to maintain this temperature, but be mindful of overheating in the summer. Shade cloths and ventilation can help regulate the temperature on hotter days.

Humidity Control

Humidity is another factor to watch. While fig trees enjoy a bit of humidity, too much can invite disease. Aim for a moderate humidity level, and if your greenhouse becomes too humid, consider using a dehumidifier or increasing air circulation with fans.

Stay tuned for more in-depth tips on nurturing your greenhouse fig trees to their fullest potential.

Choosing Fertilizers for Figs

Feeding your fig trees is like setting the table for a feast—it’s all about providing the right nutrients at the right time. Use a balanced fertilizer with equal parts nitrogen, phosphorus, and potassium (such as a 10-10-10 NPK formula). These nutrients support leafy growth, root development, and fruit set. However, don’t overdo it; too much fertilizer can lead to lush growth at the expense of fruit production. Apply fertilizer every four weeks during the growing season, tapering off as the tree approaches dormancy.

Watering Schedules for Optimal Growth

Water is the lifeblood of your fig trees, and consistent watering is key to their health. The goal is to keep the soil consistently moist but not soggy. During the active growing season, water your fig trees thoroughly whenever the top inch of soil feels dry to the touch. Reduce watering in the winter when the trees are dormant. Remember, greenhouse conditions can accelerate evaporation, so keep a close eye on soil moisture.

Signs of Overwatering or Underwatering

Overwatering and underwatering can both spell trouble for your fig trees. Here’s what to watch for:

Overwatering: Yellowing leaves, a musty smell, and a soggy soil base are telltale signs. If you notice these symptoms, cut back on watering and improve drainage.

Underwatering: Wilted or drooping leaves and dry, cracking soil are red flags. Increase watering frequency and consider mulching to help retain soil moisture.

The Balancing Act: Pruning and Training Fig Trees

Pruning and training your fig trees not only keeps them looking neat but also promotes healthy growth and fruit production. Pruning allows light and air to reach the inner branches, which is vital for the development of fruit.

For training, use gentle techniques to guide the growth of your fig trees. Espalier, the art of training trees against a flat surface, is a popular method for space management in greenhouses. This technique not only saves space but can also turn your fig trees into living sculptures.

Pruning for Health and Productivity

Prune your fig trees in late winter or early spring before new growth begins. Focus on removing dead or diseased wood, thinning out crowded branches, and shaping the tree. Always use clean, sharp pruning tools to make clean cuts. This will encourage strong, healthy growth and bountiful fruit.

Training Techniques for Space Management

Training your fig trees when they’re young is beneficial. Attach the main branches to a trellis or wall with soft ties, guiding them to grow in the desired shape. As the tree matures, continue to prune and tie new growth, maintaining the structure you’ve established. This proactive approach will save you space and make your greenhouse fig orchard a model of efficiency and beauty.

Reaping Rewards: When to Harvest

The moment you’ve been waiting for—harvest time! Fig trees usually bear fruit twice a year, in early summer and late summer to fall. The fruit is ripe when it’s soft to the touch and hangs downward. If you gently twist the fig and it comes away easily, it’s ready to eat. But be quick to harvest; ripe figs attract birds and can spoil rapidly.

Guardians of the Greenhouse: Pest and Disease Management

Protecting your fig trees from pests and diseases is essential for a healthy greenhouse. Regular inspections are your first line of defense. Look for signs of trouble like chewed leaves, sticky residue, or unusual spots on the fruit.

Identifying Common Fig Tree Pests

Common pests that love fig trees include spider mites, aphids, and mealybugs. These tiny critters can be controlled with a strong jet of water to knock them off the plant, or with insecticidal soap. For organic control, introduce natural predators like ladybugs into your greenhouse.

  • Spider Mites: Look for fine webs and yellow stippling on leaves.
  • Aphids: Watch for clusters of small, pear-shaped insects on new growth.
  • Mealybugs: Identify these pests by the cottony masses they leave on stems and leaves.

Remember, early detection and treatment are key to managing these pests.

Preventing Diseases in Greenhouse Conditions

Greenhouse conditions can create a haven for diseases like fig rust, leaf blight, and root rot. To prevent these issues, ensure good air circulation, avoid overhead watering, and keep the foliage dry. If diseases do appear, remove affected parts of the plant immediately and dispose of them away from your greenhouse.

Example: If you notice a brownish-orange dust on the underside of leaves, you might be dealing with fig rust. Increase air circulation and consider applying a fungicide to prevent spread.

By following these steps, you’ll be well on your way to growing healthy, productive greenhouse fig trees. Stay vigilant, and you’ll enjoy the fruits of your labor for years to come.

Greenhouse gardening offers a unique opportunity to control the environment for your plants, and when it comes to fig trees, this means you can provide optimal conditions for growth year-round. With the right techniques, you can avoid common pitfalls and ensure your fig trees are healthy, vibrant, and productive.

Organic Solutions for Pests and Diseases

Pests and diseases can be a challenge in any garden, but in the controlled environment of a greenhouse, organic solutions are both effective and preferable. For pests like spider mites, aphids, and mealybugs, organic insecticidal soaps can be a safe and effective treatment. Neem oil is another versatile option that can help manage both pests and fungal diseases. Introducing beneficial insects, such as ladybugs and lacewings, can also help keep pest populations in check naturally.

Frequently Asked Questions (FAQs)

Q1: Why is my fig tree not producing fruit?

There could be several reasons why your fig tree isn’t producing fruit. It may not be mature enough—fig trees typically start bearing fruit at 2-6 years of age. Insufficient sunlight, overwatering, or a lack of nutrients can also affect fruit production. Ensure that your fig tree is getting enough light, is not sitting in water, and is fertilized appropriately. Sometimes, simply being patient and providing consistent care is all that’s needed.

Q2: Can fig trees survive winter inside a greenhouse?

Yes, fig trees can survive winter inside a greenhouse, provided the temperature does not drop below their tolerance level. Most fig trees can withstand temperatures down to about 20°F, but in a greenhouse, you should aim to keep the temperature above freezing to prevent damage to the tree. Using a greenhouse heater can help maintain a consistent temperature during the colder months.

For example, one winter, I used a small electric heater with a thermostat to maintain a steady temperature of around 35°F in my greenhouse. My fig trees remained healthy and resumed vigorous growth in the spring.

Q3: How often should I prune my greenhouse fig trees?

Prune your greenhouse fig trees annually, ideally during the dormant season in late winter or early spring. This helps to maintain their shape, remove any dead or diseased wood, and encourage new growth that will produce fruit. If you’re training your fig trees to a certain shape, such as an espalier, you may need to prune more frequently to maintain the desired form.

Q4: What is the best way to increase humidity for my fig trees in a dry climate?

To increase humidity for your fig trees in a dry climate, you can use a humidifier or mist the trees regularly. Placing water trays near the trees can also help raise humidity levels. Additionally, grouping plants together can create a microclimate with higher humidity. Just be sure to monitor the humidity closely to prevent fungal diseases.

Q4: How do I know if my fig tree in the greenhouse is overwatered?

Signs of overwatering include yellowing leaves, stunted growth, and a general lack of vigor. You may also notice that the soil remains soggy and waterlogged between waterings. To avoid overwatering, make sure your soil mix drains well and adjust your watering schedule according to the tree’s needs, reducing frequency during the dormant season.

Final Words

By following these tips and maintaining a watchful eye on your greenhouse environment, you can grow healthy and productive fig trees. Remember, each tree is unique, and what works for one may not work for another. Observe your trees closely, be responsive to their needs, and enjoy the delicious rewards of your labor!

grant yost greenhouse innovator

Grant Yost

Grant Yost is co-owner of Beulah Land Farms, a small business that is part of and trying to push forward the local food movement. Although I grew up on a farm in the middle of Kansas, we took the wheat and other grain to the elevator, and then went to the grocery store to buy all our food. Maybe it's a generational thing, but we should be growing our own food as much as possible! My wife was diagnosed with Graves disease, which is an auto-immune disease affecting the thyroid, and while it wasn't debilitating (we are grateful for that) we have to wonder if it had to do with processed food and our mass-produced food supply. Auto-immune epidemic anyone? Also, maybe a generational thing... we live in the city in Kansas City, but our kids want to move to the farm!

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