Hydrogel is a substance that is gelatinous when it comes in contact with water.
It is used in the shipping of bareroot trees and shrubs to protect the roots
from drying out. As far as use in potting mixes, it is expensive and probably
wont do much, just like products such as "soil moist". There was a good
article in the last issue of american nurseryman that had some information on
it. You may be able to acces the article on thier website,
www.amerinursery.com.

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