Guides
12 posts in Guides.
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Guides Frost Blanket for Plants: Weight, Fabric, and When to Cover
Frost blankets add 2-8°F of protection depending on fabric weight. The real weight classes, when to cover plants for frost, and when the cover cooks your crops
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Guides Polycarbonate Glazing Explained: 4mm to 16mm Compared
4mm vs 6mm vs 8mm vs 10mm twin-wall polycarbonate: R-values, light transmission, and UV coatings compiled from manufacturer spec sheets, decoded model by model.
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How to Power a Greenhouse: GFCI, Circuits, and Safe Wiring
A 1,500-watt heater needs a dedicated 20-amp circuit. Every greenhouse outlet requires GFCI protection. Here is the load plan to bring to your electrician.
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Greenhouse Permits: Do You Need One to Build a Kit?
Most backyard greenhouses under 200 square feet avoid permits, but foundation type and local jurisdiction are the variables that change everything.
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Greenhouse Site Selection: Sun, Wind, and Drainage
Fifteen mph winds can double greenhouse heat loss. The site checklist covering sun hours, orientation, slope, and utility access before you buy a kit.
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Greenhouse Ventilation: Fan Sizing and Auto Vent Openers
A 10x12 greenhouse needs a 975 CFM fan. Auto vent openers use wax to open at 55-75 degrees F with no electricity. Without both, heat kills before frost does.
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Greenhouse Snow and Wind Loads: What the Ratings Mean
The math behind greenhouse snow load ratings and wind specs, with a verified kit-by-kit comparison and a guide to matching specs to your climate zone.
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Greenhouse Summer Cooling: Shade Cloth and Ventilation
Unventilated greenhouses kill summer crops. Shade cloth percentages, fan sizing, and evaporative cooling techniques to keep temperatures in the growing range.
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Growing Food in an Unheated Greenhouse All Winter Long
Mache and kale survive to 10°F under minimal protection. This is the crop-by-crop guide to what actually grows in an unheated winter greenhouse.
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Cheap Greenhouse Heating: Bubble Wrap, Barrels, and BTU Math
Cut greenhouse heating costs without a furnace. Horticultural bubble wrap, water barrel thermal mass, and a correctly sized heater. Verified June 2026.
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Greenhouse Plastic: Mil, UV Life, and Which Film to Buy
6 mil vs woven, clear vs high-diffusion, 4-year vs 1-year: what the spec sheet numbers mean for your growing season and budget. Verified June 2026.
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Greenhouse Foundation Guide: Bases That Beat Frost
Greenhouse foundation options compared: treated lumber, gravel, pavers, and concrete, plus frost heave, leveling, permits, and computed base costs for 2026.