Keeping hydrangea blue
"Geoff" wrote in message
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The plant might stay blue for a few years.
Geoff, a serious question - neither my husband or I drink tea, we are
freshly ground coffee drinkers, would that do?
I found my narrow band indicator papers and just as my wife was about to
start a fresh brew, I managed to rescue to the last lot's grouts. I
pressed a piece of pH 4 to 6 paper in them and found the pH to be between
4 and 4.5. Anything less that pH 7 is considered to be acidic. So,
coffee grouts will add acidity to the soil with the added bonus of keeping
the hydrangeas awake!!!
I do not like tea either!
Geoff
Starbucks give away pre-packed bags of old coffee to be used within the
garden
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