1. Clean, Clean, Clean
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Start by removing any debris like old plant matter, dead leaves, or weeds.
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Wash down the walls and windows with warm, soapy water to let in maximum sunlight.
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Disinfect pots, trays, and tools to prevent disease from spreading to your spring seedlings.

2. Inspect for Repairs
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Check for cracks or holes in the glazing (those will lose you precious warmth!).
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Tighten or replace any loose screws, bolts, or hinges.
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Test door and window seals to ensure proper insulation.

3. Service Your Ventilation System
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Clean out vents, fans, and filters to remove dust and debris.
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Test all fans to make sure they’re working properly.
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If you’re using automatic vent openers, ensure they’re calibrated and ready to go.
4. Prepare Your Growing Spaces
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Top up or replace potting soil if it’s compacted or depleted.
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Organize your seed trays, pots, and containers for easy access.
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Set up or repair benches, shelves, or raised beds for planting.

5. Check Your Watering System
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Flush out irrigation lines to clear any blockages.
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Check hoses and fittings for leaks.
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Test timers and controllers to make sure they’re functioning as expected.
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6. Test Your Heat Source
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Use a thermometer to monitor the temperature inside your greenhouse, especially at night.
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Ensure your heater is functioning properly and can maintain a consistent temperature.
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Make adjustments as needed to prevent cold damage to your seedlings.
7. Restock Supplies
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Inventory your seeds and order any new varieties you’ve been eyeing.
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Stock up on fertilizer, pest control products, and any other essentials.
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Make sure you have enough labels and markers to keep your plants organized.

8. Plan Your Planting Schedule
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Map out your planting space, including which plants need full sun or shade.
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Stagger plantings to keep the harvest coming all season long and free up space int he greenhouse.
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Consider companion planting to make the most of your space and reduce pests naturally.
