Borax as PreservativeUpdated: February 9th, 2017
As I intend to use borax to help preserve wood and canvas I am concerned about it's toxicity to plants:
Boron is an essential micronutrient which means it is essential for plant growth and development, but is required in very small quantities. Although Boron requirements vary among crops, the optimum boron content of the leaves for most crops is 20-100 ppm . . . Typical applications of actual boron are about 1.1 kg/hectare or 1.0 lb/acre but optimum levels of boron vary with plant type.
Unless used in small amounts -- such as 1/2 teaspoon in a gallon of water -- Borax is toxic to plants. . . . Or mix 1/2 cup of borax in a gallon of water and apply to the base of weeds to act as a liquid herbicide on the roots.
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