Winter greenhouse gardening focuses on cool-season plants that can thrive in lower light and cooler temperatures. Here are some of the top options for year-round success:
Bonus: Citrus trees like lemons or limes can overwinter successfully in cooler greenhouses with extra protection.
Caring for plants during the winter months requires attention to detail and adaptation to seasonal challenges. While growing conditions may differ from other times of the year, a few fundamental practices can ensure your plants stay healthy and productive.
One of the most important aspects of winter greenhouse care is maintaining optimal temperatures. Many winter crops thrive in temperatures ranging from 45°F (7°C) to 65°F (18°C). This balance can be achieved using a reliable greenhouse heater to provide warmth during cold nights and proper ventilation to avoid overheating on sunny days. A thermometer placed in your greenhouse is essential for monitoring these fluctuations and ensuring your plants remain within their preferred range.
Lighting is another critical factor for winter greenhouse success. Since days are shorter and sunlight is weaker during the winter, plants may not receive adequate natural light. Placing crops where they can capture the most sunlight is a good start, but supplemental grow lights can make a big difference. These lights can extend the growing hours to 12-16 hours per day, providing your plants with the energy they need for healthy growth.
Watering practices also need adjustments in winter. Plants generally require less water during colder months due to slower growth rates and reduced evaporation. It's best to water in the morning, allowing any excess moisture to evaporate during the day. This approach minimizes the risk of root rot and fungal diseases, which are more likely to occur in damp conditions. Good drainage is equally crucial; ensuring your pots and soil allow excess water to escape.
Humidity levels inside the greenhouse should also be carefully managed. High humidity can create an environment where mold and mildew thrive. A simple way to regulate this is having a greenhouse/outdoor-use fan running around the clock in your greenhouse garden. This will allow for increased airflow causing moisture to circulate either out your vents or to your plants to help in their growth. Ventilation and spacing plants appropriately improve air circulation and reduces the risk of fungal issues.
The soil and nutrients you provide also play a key role in winter plant care. Using nutrient-rich, well-draining soil sets your plants up for success. While plants grow more slowly in winter, they still require consistent supply of nutrients, albeit in smaller quantities. Over-fertilizing can stress plants, so use fertilizer sparingly and according to the needs of each crop.
Pests, although less prevalent in winter, can still pose a threat to your greenhouse garden. Regularly inspect your plants for signs of common greenhouse pests like aphids or whiteflies. Organic methods, such as neem oil or insecticidal soaps, can help manage these pests without harming your plants.
By taking these steps, your winter greenhouse will be well-equipped to produce a bounty of fresh and healthy plants all season long.
Factor |
Ideal Range |
Tip |
| Temperature | 45-65°F (7-18°C) | Add insulation for stability |
| Light | 12-16 hours/day | Use full-spectrum LEDs |
| Humidity | 50-70% | Ventilate and use fans |
| Watering | Light & infrequent | Morning watering only |
| Soil | Nutrient-rich, well-draining | Avoid compacted mixes |
Winter greenhouse gardening offers a rewarding way to enjoy fresh, homegrown product even in the coldest months. By choosing the right crops and providing proper care, you can keep your green thumb active year-round. Whether you're a seasoned gardener or just starting out winter, is the perfect time to embrace the magic of greenhouse gardening. Happy growing!