Dr. H. Soerensen, credited with introducing the concept of ph value. The flowers are of the Hydrengea family and turn blue or reddish, reflecting the ph of the soil in which the plan grows.
Monday, January 16, 2012
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Dr. H. Soerensen, credited with introducing the concept of ph value. The flowers are of the Hydrengea family and turn blue or reddish, reflecting the ph of the soil in which the plan grows.
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