Asked by: Arles Eickhoff
asked in category: General Last Updated: 10th April, 2020

What will make hydrangeas blue?

To encourage blue hydrangea flowers, grow the plant in soil that has a pH of 5.2-5.5. If your soil is more alkaline, you can lower the pH by applying Soil Acidifier at the rate specified on the package. Soil pH can also be lowered (more gradually) by applying an acidic organic mulch, such as pine needles or pine bark.

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Subsequently, one may also ask, how do I make blue hydrangeas with vinegar?

To increase the acidity of your garden's soil, use vinegar! For each gallon of water in your watering can, add one cup of white distilled vinegar and pour on your hydrangeas. The acidity of the vinegar will turn your pink hydrangeas blue or keep your blue blooms from turning pink.

Also Know, how long does it take to turn hydrangeas blue? The label recommends sprinkling about 1-2 cups around the plant and watering it in. Repeat at 60-day intervals until you get the color you want. My hydrangea just received its third application and I'm still waiting for the first sign of blue.

Moreover, does Epsom salt turn hydrangeas blue?

Since the blue color of a hydrangea is formed by aluminum made available in acid soil, adding Epsom salt would not make your flowers change color. Alum (aluminum sulfate) is acidifying and would give the effect you want at two tablespoons per plant.

Do coffee grounds make hydrangeas blue?

If you're growing hydrangeas, use coffee grounds to affect their color. Coffee grounds add extra acidity to the soil around hydrangeas. On a chemical level, this increased acidity makes it easier for the plant to absorb naturally occurring aluminum in the dirt. The effect is pretty blue clusters of flowers.

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