Blue Hydrangea Flower
Question: I had a blue hydrangea on the east side of my house, and last spring I moved it around to the west. It is pink around on that side of the house and I would like to know what to use to keep it blue. N.H., Tennessee.
Answer: The common French hydrangea depends for color on the presence of aluminum in the plant. In turn, the availability of this aluminum to the plant is directly influenced by the acidity of the soil. The soil on the east side of your house is more acid than on the west side. The soil may be acidified by the application of aluminum sulphate. Use about 2 ounces of aluminum sulphate to each square foot to be treated.
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