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Video:How to Change the Color of Your Hydrangeas

with Dave Ethepare

Hydrangeas are great to plant because you can change the color of their flowers by changing the acidity of the soil. Here's an instructional video on how to change the color of your hydrangeas.See Transcript

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Transcript:How to Change the Color of Your Hydrangeas

Hi, I'm Dave Ethepare with Dennis' 7 Dees Landscaping and Gardening Centers in Portland, Oregon, with About.com. Today, we're going to be talking about changing the color of your hydrangeas.

Aluminum Sulfate Affects Hydrangea Color

It is one of the plants that changes color dramatically, so people do know that you can change their color from pink to blue, they're just not sure how to do it. But it is a very simple process. If you've got pink hydrangeas and you want to turn them blue, you would add aluminum sulfate. The aluminum sulfate can be added about every 4 to 6 weeks during the growing season. So you might end up adding it three, maybe as many times as five times a year, follow the instructions, and be careful to not overdo it.

Changing Hydrangeas From Blue to Pink and Pink to Blue

For blue hydrangeas, you need an acid soil. You'll have to maintain the pH of the soil, and if you're in a soil that's alkaline and you want them blue, you're going to have to maintain that acid soil by adding the aluminum sulfate year in and year out. For pink hydrangeas, you need an alkaline soil. If you're in an acid soil and you want to turn them pink, you're going to have to add lime. The lime will take an acid soil and move the pH closer to 7 and that will cause them to turn pink. So, you would add lime every spring, fall and maybe even summer, also. Lime is something you have to continually add every year or else eventually they will revert back to blue.

Maintaining Hydrangea Color

White hydrangeas will always be white. You can't change them from pink to blue, they will continue to be white. As they fade, sometimes they take on a hue of pink or a hue of blue, but they will always be white. If you want to change the color of your hydrangea and keep it that color, whether you're going from blue to pink or pink to blue, it's something you have to do as maintenance. You can't quit trying to change the pH or the pH will revert back to its original pH, depending on the climate you're in. And a lot of it is variety. A Nikko blue will never get that deep purple color, it will always be blue. Endless Summer is a good one for changing from almost a dark purple to a blue to a pink. It changes very well.

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