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No, coffee grounds do not keep hydrangeas blue on their own.

Specifically, the blue blooms on the hydrangea are the result of the plant being able to take aluminum from the soil into the roots. Aluminum has to be in soluble form for plant root intake. A soil that is too dry impedes adequate aluminum intake and therefore proper blue blossoming. Coffee grounds work to retain moisture in soil.

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Q: Will coffee grounds keep hydrangeas blue?
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Do coffee grounds keep rabbits out of gardens?

Yes, coffee grounds keep rabbits out of gardens, according to anecdotal, not scientifically researched, gardening. The leptorids in question prefer to avoid harsh textures and strong smells. Fresh coffee grounds tend to reinforce acidic power of hydrogen (pH) while unwashed grounds will lower soil pH and used grounds will function neutrally.


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Does baking soda in the soil keep hydrangeas blue?

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Do African violets grow in acid soil?

Yes, African violets like acid soil, some people mix coffee grounds in around the soil to keep it acidic.


What is a good cat repellant?

One way to keep cats out of your garden is the following: Every time you make a pot of coffee, set aside the used coffee grounds until they are dried out (you can continuously use a plastic container specifically for thisa purpose). One the used coffee grounds are dried out, take them out to your garden and spread/sprinkle them in and around the area where you don't want cats going. The extra benefit of this is that the used coffee grounds have certain nitrates in them that plants love and therefore they are a good fertilizer as well.


What can you use to keep cats away from your house?

keep cats off your porch with coffee grounds and/or orange rinds and/or something shiny == == ----


What is the function of the coffee maker?

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How do you make white hydrangea turn blue?

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How do you keep bugs away without using pesticides?

Some of the best ways to keep bugs away without using pesticides in the garden, are to use egg shells and organic products such as used coffee grounds. The acidic nature will help ward off bugs.