How to change the color of your hydrangeas

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Love your hydrangeas but want to see how they would look in a different color? Depending on the variety, you you may be able to change their color yourself. Here’s what you should know.

Not all hydrangeas can change color

Before we continue, it’s worth mentioning that not all hydrangeas are capable of changing color. That those with that ability include some bigleaf hydrangeas (H. macrophylla) – especially mophead and lacecap types – and H.serrata Sorts. And while pink and blue hydrangeas of these cultivars can change color, those with white flowers cannot.

How does hydrangeas change color?

That Farmers Almanac recommends Wait until a hydrangea is at least two years old before attempting to change the color of its flowers. It is also important to remember that the color change is not instantaneous: it usually takes several weeks or months for the transformation to occur.

The color of hydrangeas is determined by how much aluminum the plant can absorb from the soil– and that depends on the pH of the soil.

Soil with a lower pH makes it easier for plants to absorb aluminium, which usually turns its flowers blue. Meanwhile, soil with a higher pH makes it harder for the plant to access aluminum, which usually means its buds are pink.

How to change the color of hydrangeas

First you must test the pH of your soil. Also, make sure you have some aluminum sulfate on hand. Here’s what to do next:

How to change pink flowers to blue flowers

off to go pink to blue flowers, increase the acidity of the soil. You can do this by making a solution of 1⁄4-ounce of aluminum sulfate per gallon of water, three times a year, starting in spring.

Repeat the process three or four weeks later and then again three or four weeks after that. If you also use the aluminum sulfate solution in the spring Apply 25-5-30 fertilizer according to manufacturer’s directions.

How to change blue flowers to pink flowers

off to go blue to pink flowers, increase the alkalinity of your soil. You can do this by sprinkling ground limestone (dolomite lime) in a ratio of four Pound per 100 square feet in spring or fall, and make sure it gets plenty of water. At the same time, apply 25-10-10 fertilizer to the plant according to the manufacturer’s instructions.

And if you happen to have water with a high mineral content (aka hard water), it can help turn blue flowers pink.

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