How to use a moisture meter

Written by phyllis benson
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A plant moisture meter is a handy gadget to measure humidity in the soil. This device helps prevent overwatering or underwatering plants. Usually it has a scale of 1 to 10, with 1 being most dry and 10 being most wet. Most meters also have a colour range composed of red, green and blue. Moisture meters are not expensive and can check plant moisture instantly.

Skill level:
Easy

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Instructions

  1. 1

    Pick a device. Moisture meters come plain or fancy. They can check moisture, light, soil acidity and other factors. A plain moisture meter is easiest to use for quick plant checks. Choose one that measures instantly and needs no batteries.

  2. 2

    Use it to check indoor plants. Hold the head or gauge end of the meter. The pointed end is the probe. Insert the probe into the soil about three-quarters down into the pot. This measures the soil moisture at the roots.

    How to use a moisture meter
  3. 3

    Enter the red zone. Some plants need dry soil. Cactus, snake plant and other low water plants are easily killed by overwatering. Their soil moisture should be low or in the red zone.

  4. 4

    Go for the green. Most plants need moderately humid soil. These include azaleas, begonias, ficus and philodendrons. Their soil humidity should be in the meter's green zone. If the meter is in the red, the plant is ready for water. If the meter is in the blue zone, the soil is too wet. Do not water again until the plant's roots show red or green.

    How to use a moisture meter
  5. 5

    Sing the blues. Some plants, such as ferns, need more water. While most plants should not be in the blue zone, which is too wet, ferns should be more in the green-blue zone than the red-green zone.

  6. 6

    Walk outdoors. The moisture meter is handy for checking outdoor plants and shrub water. It is especially helpful if the plants have drip irrigation. If you think the emitters have clogged or are not putting out the right amount of water, use the moisture meter to check some places around the plant.

  7. 7

    Monitor frequently. Use the meter to spot-check your plants. Do not leave the meter in the plant for long. Wipe off the probe and keep the moisture meter dry and clean.

    How to use a moisture meter

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