7/20/2023 0 Comments Color me pink fertilizer![]() Caution: too much aluminum sulfate will injure plants. Mulch with peat or pine bark.Įxact amounts of lime or aluminum sulfate needed to get the flower color you want will vary depending on current soil pH and soil type. To lower pH apply an acidic fertilizer such as aluminum sulfate, or wettable sulphur. Too much lime can cause new growth to yellow due to lack of iron. To raise pH, add limestone according to directions on the bag. Between pH 5.5 and pH 6.5, the flowers will be purple, or a mixture of blue and pink on the same plant. Most soils have enough aluminum, but the aluminum is not available to the plant if the soil pH is high.įor most bigleaf hydrangeas, blue flowers will be produced in acidic soil (pH 6.5) will usually produce pink flowers. Some cultivars of these are better suited for blue flowers while others are best grown as pink.Īluminum in the tissue of hydrangea flowers causes the blue coloration. Only bigleaf (Hydrangea macrophylla ) or mountain hydrangea (Hydrangea serrata) flowers will turn blue. Once you know the general pH of your soil, you can adjust it to get pink or blue hydrangea blooms.To see if you can encourage your hydrangea to produce blue or pink flowers, determine what kind of hydrangea you have! Most types of hydrangeas grown in Massachusetts are listed in the table below. You can buy a soil test kit at your local garden center to determine the pH of the soil, but here is a quick and simple way to figure out your soil’s pH with ingredients from the kitchen. ![]() ![]() Acidic soil (lower pH) will yield blue flowers and alkaline (higher pH) will give you pink flowers. The first thing you need to do is test the pH of your soil. Although I must say that changing the hydrangea bloom colour so drastically is pretty darn exciting! Soil Test White ones do not change, and some varieties are bred for a specific colour palette.Īnd before you get too excited, you cannot change the intensity of the hydrangea colour that is more dependent on the environment or weather. Not all hydrangea species change colour, however. Less aluminum in the soil and/or alkaline soil will create a variation of pink blooms. High levels of aluminum in the soil plus an acidic soil pH will generate the coveted bright blue to purple flowers. Frequently Asked Questions About Changing Colour of Hydrangeas.Changing the Colour of Hydrangea Flowers to Pink.Changing the Colour of Hydrangea Flowers to Blue.How to Change the Colour of a Hydrangea.This is the best way to ensure you get the colour you want.īut, if you have a hydrangea already in your garden and are just dreaming of a sea of pink or blue, you can try changing the colour of your hydrangea with these tips. ![]() If you really want a pink or blue hydrangea, I suggest buying a variety that’s already in that colour. Instead, I suggest becoming content with the hydrangea colours you already have. It can take well over a year to change the pH of your soil and it requires quite a bit of work. The blooms can change colour based on the amount of aluminum the plants absorb from the soil, which depends on the soil pH.īut I’ll admit that the process isn’t easy. serrata can range in colour from pink to blue, with every shade of fuchsia, plum, and periwinkle in between. Hydrangea varieties such as Hydrangea macrophylla and H. ![]()
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