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How to Plant Wildflowers
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Perennial Planting Guide
Step by step instructions on how to plant your bare root or potted perennials when they arrive.
Spring Flower Bulb Planting Guides
Step by step instructions on how to plant your spring-planted flower bulbs when they arrive.
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A common question we get from gardeners each year is: "Why are my blue Hydrangeas pink, or, Why are my pink Hydrangeas blue?" The answer is really quite simple (and no, it's not magic). The color of your Hydrangea blooms are directly linked to the PH levels of your soil.
Knowing this important information means you can easily (well, somewhat easily) change the color of your Hydrangea blooms! Alkaline soil produces pink blooms and acidic soil produces blue blooms. The first step in determining the PH of your soil is to do a soil PH test to determine the acidity of your soil.
A test result below 7 means that your soil is acidic (blue blooms). To raise the PH of your soil (to turn blooms pink), try adding limestone – most packages will tell you how much to add to increase your PH to the correct levels.You can also try using a fertilizer with high levels of phosphorus in it. This helps keep the aluminum in your soil from entering the root system of your plant. If you can't seem to lower the acidity in your garden beds, consider planting in pots.
A test result above 7 means that your soil is alkaline (pink blooms). To lower the pH of your soil (to turn blooms blue), you can add things such as sulfur, compost, pine needles, or pine bark. This will help to add some acidity to your soil. You can also try an organic fertilizer that is low in Phosphorus and high in Potassium.
Limelight has cool lime green bloom. A spectacular large shrub with magnificent flower color. PP#12874 (Hydrangea paniculata)...
Annabelle' Hydrangea is famous for its huge, snow-white blooms and excellent cold hardiness. This shorter variety grows 3 - 5 ft tall and flowers reliably, even after severe winters ...
'All Summer Beauty' Hydrangea is a compact, long-blooming mophead variety that produces big, bouncy flowers on 4 ft shrubs. Because it blooms on both new growth and old wood, flowers...
'Nikko Blue' Hydrangea is a fast-growing shrub with large, rounded flower clusters that bloom in a rich, sky blue throughout the summer season. When planted in alkaline soils, blooms...
The best success rate comes from gardeners who grow their Hydrangeas in containers, which allows for them to completely control the acidity of the soil with no outside factors.
Also note that it is easier to change a pink Hydrangea to blue than blue to pink. Other colors of Hydrangea cannot change colors with soil acidity.
What experience do you have changing the colors of your Hydrangeas? Please post in the comments below or on our Facebook Page.