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Hydrangeas will turn a richer blue when natural ingredient is added to the soil
"Hydrangeas turn a deeper blue [or] violet when coffee grounds are added to the soil." Another added: "I have been using [coffee grounds] for 20-something years; sometimes directly onto veggies ...
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Mistakes Everyone Makes When Trying To Grow Wild Violets
Read more: 10 Mistakes Everyone Makes When Planting Hydrangeas Another mistake gardeners often make is not providing the ...