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Organic Backyard Gardening: PlanMyGarden.com | Your Custom Vegetable Garden Planner

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Last Updated on September 18, 2026

Maple Syrup Hydrometer Temperature Correction

A maple syrup hydrometer only reads true at the two temperatures printed on it, a cold test mark calibrated for syrup at about 60°F and a hot test mark calibrated for syrup at or above 211°F. At any other temperature the same actual density shows a different number, so the...


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Last Updated on September 18, 2026

Maple Syrup Finishing Temperature (and Your Altitude)

Maple syrup is finished when it boils at about 7.1°F above the boiling point of plain water at your location that day, not at a fixed number like 219°F. Water’s boiling point moves with altitude and the day’s weather, so the true finishing temperature moves with it...


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Last Updated on September 18, 2026

How Many Taps per Maple Tree? Tree Size and Tap Counts

One tap for a tree 10 to 18 inches across, two taps for 18 to 25 inches, and three taps only on a very healthy tree over 25 inches, which is the most any tree should ever carry. That is the modern, conservative guidance from University of Maine Cooperative Extensi...


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Last Updated on September 18, 2026

Greenhouse Heater Size Calculator (BTU by Size and Glazing)

BTU per hour = surface area (square feet) x temperature difference (degrees F) x U-value for the glazing. A 20×12 ft hoop house in single-layer polyethylene, held at 60F on a 10F night, needs about 28,915 BTU per hour (490 square feet x 50F x 1.18). The calcu...


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Last Updated on September 18, 2026

Seed Viability Chart: How Long Vegetable Seeds Last

Most vegetable seeds stay viable for 1 to 5 years when stored properly, though a few last longer and a few last only a season. Onions and parsley are done in about a year, beans, carrots, broccoli and peas hold for about 3, and cucumbers, radishes and lettuce can still grow after 5 t...


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