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Speaking of capillary action and science education. It's bad enough that sub-irrigation planters using capillary action are called 'self-watering.' Now we have capillary action referred to as evaporation.
You might get some humidity in the air through evaporation, but it's not going to water the plant.
How does it work?
At the bottom of the planter, there is a 1-gallon reservoir. Through evaporation, the water in the reservoir moisten(s) the soil above it. The reservoir is refill(ed) through a filling tube.
Via: GadgetGrid
Source: Gardener’s Supply
NOTE
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e-mail Bob Hyland
bobhyland[AT]insideplantslive [dot]org