I like your article about changing hydrangeas colours. You talk about lime added to the soil to change the acidity of the soil and plant colour. Could you use a large amount of crushed egg shells instead of commercial lime to produce the same affect on the soil? Thank you for your help.
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What I was reading is that changing the acidity levels of the soil, as well as manipulating the plant's access to aluminum can change the colours of the hydrangeas. If eggshell can change or repel/attract aluminum, it would work.
"Generally, an acidic or low pH will induce 'blueness'; whereas, a higher or alkaline pH will induce 'pinkness or redness'. Work in England seems to indicate that higher aluminum content influences blueness more than pH levels."
www.hydrangeashydrangeas.com/
eggshells are considered alkaline and here's an actual study saying whether they could be useful for liming: www.agronext.iastate.edu/
Frog HGTV com:
Generally speaking, acidic soil, with a pH lower than 6.0, yields blue or lavender-blue hydrangea blooms. Alkaline soil, with a pH above 7.0, promotes pinks and reds.
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