Take the guesswork out of knowing when to water your houseplants. It's now made easier with Wormie Water Sensor. Adorable terra-cotta "worms" absorb water, so when the soil is wet, they darken in color. They return to their original color when the soil dries out, making it easy to see when it's time to water! Each worm is 4-1/2 inches tall.
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