Hydrangeas mainly flower in shades of blue, pink and white. But the colouring may depend on the type of soil you have - some hydrangeas produce blue flowers on acid soils and pink on alkaline soils. And certain cultivars produce better colour than others. Here are our top choices. Hydrangeas with blue flowers on acid soil The lace-cap Hydrangea (Hydrangea macrophylla) is a popular variety due to its delicate and lacy flowers that bloom in shades of blue, pink, and white. This variety is unique in how the smaller flowers are arranged in the centre, surrounded by a ring of larger and showier blooms.
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Botanical Overview Hydrangea Colors FAQs: Key Takeaways Hydrangea colors are available in pink, purple, blue, white, and green across several species. Acidic soils will lead some to turn blue, while alkaline soil will cause your Hydrangeas to bloom pink. Maintaining such a narrow pH range is easier to do with container culture than in the ground. Name: Cityline Mars hydrangea ( Hydrangea macrophylla Cityline 'Mars') USDA Hardiness Zones: 5-9. Flower Color: Blue, pink. Light: Full sun, partial shade. Mature Size: 1-3 ft. tall and wide. Continue to 5 of 14 below. 16. Hydrangea macrophylla 'Masja'. (Image credit: P Tomlins/Alamy Stock Photo) Hardiness: USDA 6-9 (UK H5) Height: 3ft (90cm) Spread: 3ft (90cm) A compact mophead hydrangea that produces rich-red flowers from mid to late summer in alkaline soil and takes on purple tones in acid soil. The hydrangea color chart below shows the estimated flower color as it varies by soil pH level. Soil with a pH under about 5.5 will tend to result in blue hydrangea blooms, while above 6.5 will favor more of a pink color. Flowers tend to be purple in the soil pH range of 5.5-6.5, which is ideal for overall nutrient absorption.
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You'll find bigleaf hydrangeas in shades of pink, red, blue, and purple, as well as white. White varieties will bloom white in all soils - they never change color. Similarly, varieties that are red (which is actually a very deep pink and not a true scarlet red) will also generally keep that color in all soils. Hydrangeas in neutral or chalky (alkaline) soils generally produce pink or mauve, slightly muddy-colored blooms. 'Pink blooms are caused by a relatively high pH, of around 7.5-8,' says John. The best way to do this is to add garden lime, available on Amazon, to the soil. Follow the instructions on the pack of your chosen product, but 1/2 cup. It takes a bit of work to change hydrangea colors, but the rewards can be quite fantastic! Remember that blue flowers like acidic soil, with a pH of 4.5-5.5, and pink ones require a pH of 6.0-7.0. Be consistent in adding amendments to the soil, test it regularly for accurate measurements, and then wait patiently - it can take several months for the changes to appear. Generally speaking, acidic soil, with a pH lower than 6.0, yields blue or lavender-blue hydrangea blooms. Alkaline soil, with a pH above 7.0, promotes pinks and reds. With a pH between 6 and 7, the blooms turn purple or bluish-pink. To lower your pH, add garden sulfur or aluminum sulfate to your soil. To raise the pH, use ground lime.
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Hydrangeas are one of the most popular flowering plants in North America. These bushes bloom with a wide variety of colors and shapes, but they're not always easy to grow. They need specific amounts of sun and water, so it's important to know how to keep them healthy year-round! Hydrangeas are unique in that, unlike most other plant or flower varieties, the color of their blooms can change with a little chemistry. The easiest way to acidify your soil and turn those blooms.
masahiro Makino/Getty Images. To turn your hydrangea flowers blue, lower the soil pH to 6.0 or lower. You can do this by purchasing a soil acidifier plant fertilizer to feed your hydrangeas every one to two weeks. Or, lower the pH of the soil organically by spreading pine needle or pine bark mulch around the plants. Boost Blue Hydrangeas With Aluminum. Soil with a lower pH—and a higher acid content—provides bluer blooms; if your soil test shows a pH above five, add aluminum sulfate or another acid to lower the pH and create a brighter, bolder blue. "The acidity of aluminum is what influences the blue color of flowers ," Myers says.
The Easy Way to Change Your Hydrangea Colors (from pink to blue and
Apply the powder form of lime to the plant's base in April, and again in October. The pH of the soil will be raised by garden lime. This prevents your hydrangea from utilizing the aluminum, which enhances both the reds and the pink blooms. You can opt to add dolomitic lime to the base of the plant and water it in. Remember that you need to adjust the soil where all the roots are. This will be about 1 to 2 feet (30 to 60 cm.) beyond the edge of the plant all the way into the base of the plant. If the test comes back that there is not enough aluminum, then you need to do a hydrangea color soil treatment that consists of adding aluminum to the soil.
