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Old October 1, 2007   #6
dice
Tomatovillian™
 
Join Date: Jan 2007
Location: PNW
Posts: 4,743
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I've used them on potted plants for years. No problems.

But there is an easy alternative: dig down about a shovel's
depth, take a handful of soil, and ball it up in your hand.
If it crumbles when you open your hand, plants need water.
If it sticks together, they don't need water yet.

This works best if your soil is of consistent composition for
a couple of feet deep. If you have a foot of loose sandy
loam above heavy clay loam, for example, a test on the
water content of the sandy loam does not tell you how wet the
heavy clay soil is down below.
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