Will growing a tomato plant will a metal stake make it
grow better? Does the metal stake capture and conduct electricity to
stimulate the plant
No, the metal would not conduct any electricity (unless struck by lightning : )
However, the metal in contact with the soil might contribute to the soil
acidity around the plant which may or may not be good depending upon the
soil's pH and fertility.
Anthony R. Brach, Ph.D.
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Update: June 2012