3rd October 2019

earth911
19

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.

Subsequently, one may also ask, how do you keep blue 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.

What do blue hydrangeas mean?

There remains some debate over the hydrangea's symbolism – with some connecting it to vanity and boastfulness (perhaps reflecting its abundance of petals and lavish, rounded shape) and others suggesting that a bouquet of hydrangea expresses the giver's gratefulness for the recipient's understanding.

What makes hydrangeas pink or blue?

Hydrangeas change color (except for the white ones) based on the pH level of their soil. The more alkaline the soil, the pinker the flowers. To make pink hydrangeas turn blue (or to keep your blue ones from turning pink), increase the acidity of soil.