What to Do in Your Greenhouse During February in Zone 3

by

February is a crucial month for gardeners in Zone 3, as it marks the transition from winter to spring. Your greenhouse can be a vital tool to kickstart the growing season, protect delicate plants, and prepare for the busy months ahead. Here’s a guide on what to do in your greenhouse during February to maximize your gardening success.

Preparing Your Greenhouse

Before the busy planting season begins, ensure your greenhouse is clean and well-maintained. Remove any debris, old plant material, and pests from previous seasons. Check for any damage to the structure, such as broken panes or leaks, and repair as needed. Proper ventilation is essential—open vents and doors on milder days to prevent humidity buildup and fungal diseases.

Heating and Temperature Control

Maintain a consistent temperature inside your greenhouse, ideally between 55°F and 70°F (13°C – 21°C). Use space heaters or heat mats if necessary, especially during cold snaps. Monitor temperatures regularly with a reliable thermometer. Proper heating ensures that seedlings and sensitive plants thrive despite outside cold weather.

Starting Seeds Indoors

February is the perfect time to start seeds for many vegetables and flowers. Use seed trays or pots filled with quality seed-starting mix. Some popular options include tomatoes, peppers, eggplants, and herbs. Keep the soil consistently moist and provide ample light—consider supplemental grow lights if natural sunlight is limited.

  • Tomatoes
  • Peppers
  • Eggplants
  • Basil and other herbs
  • Flowers like petunias and marigolds

Transplanting and Hardening Off

As seedlings grow stronger, gradually acclimate them to outdoor conditions through a process called hardening off. Start by placing them outside for a few hours each day, increasing exposure gradually over a week. Transplant hardy plants into your garden once the risk of frost has passed, usually in late February or early March in Zone 3.

Growing Vegetables in the Greenhouse

February is also a good time to grow cool-season vegetables directly in your greenhouse. Lettuce, spinach, radishes, and carrots can be started early and harvested before the main planting season. Use containers or beds with good drainage and keep the soil moist and nutrient-rich.

Pest and Disease Prevention

Monitor plants regularly for signs of pests like aphids, whiteflies, and spider mites. Keep humidity levels in check to prevent fungal diseases. Use organic pest control methods and ensure good air circulation. Removing infected plants promptly helps maintain a healthy greenhouse environment.

Additional Tips for February

  • Ventilate daily to reduce humidity and promote healthy growth.
  • Use reflective materials to maximize available light.
  • Plan your planting schedule for the upcoming months.
  • Keep tools and supplies organized for easy access.

By following these steps, you can make the most of your greenhouse during February in Zone 3, ensuring a productive and enjoyable gardening season ahead.