how to change the color of your hydrangeas

The key to color-changing hydrangeas is whether the soil is acidic or In order for hydrangeas to be beautiful blue, the soil must be on the acidic side, with pH lower than six. ... By spreading pine needle or pine bark mulch around the plants, Or, lower pH of the soil..

global warming and ocean acidification accelerate

then the oceans would be 144% more acidic than in the late 19th century or, equivalently, almost twice as acidic as they are today. Those future acidic oceans at pH=7.8 would reproduce conditions during Miocene, 14 to 17 million years ago, when Earth was several degrees warmer..

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