If you add coffee grounds you can naturally make your soil a bit more acidic and as a result, you can produce blue blooms. Auburn University, College of Agriculture: Hydrangea, Better Homes & Gardens: Choose the Top Hydrangeas for Your Garden, University of Illinois Extension: Hydrangea Color. Coffee grounds will not only help you to change the acidity and therefore the colour of your flowers but they are very helpful in moisture retention. Flower buds will start to develop on hydrangeas once they are two or three years old depending on the species you have. Before you swing by your coffee shop to pick up pounds of grounds, understand the process to help your hydrangea produce blue blooms. While adding coffee grounds may reduce soil pH, making it more acidic, the effect is temporary. The acidity of the grounds provides the key element, though aluminum sulfate or eggshells also produce the same effect. Most buds will start to develop in the winter and then continue to develop throughout the spring such that they produce beautiful flowers at the end of summer and the beginning of fall. Turn the soil around the hydrangea, being careful not to injure the roots. Copyright of hydrangeaguide.com 2020. It looks great too. i just want to know how often i should add grounds to them (sprinkled on the top). Well, it isn’t a very fast process. Image by Elias Shariff Falla Mardini from Pixabay. Alternately, dump your coffee grounds into your compost bin and add the compost as part of your twice-yearly fertilizing ritual for your hydrangeas. What with the blues, purples, pink, and white hues, you can make almost any colour in your garden. Many people add things like aluminium sulfate or eggshells in order to achieve the same effect. So if you add coffee grounds to your soil, the earlier you add them, the sooner you will get changes in colour assuming that the plant you have is old enough to produce blooms. Coffee grounds are one way to create soil that supports the growth of more unusual-colored hydrangea blooms. This will help to naturally fertilize every 6 months.eval(ez_write_tag([[300,250],'hydrangeaguide_com-medrectangle-4','ezslot_13',105,'0','0'])); After you have added the coffee grounds by digging into the soil, maybe even tossing it on top, you should keep testing the soil acidity to make sure that it’s where you want it to be. The effect is pretty blue clusters of flowers Bear in mind that your soil will naturally return to its original state so adding it into your fertilizer through your compost bin is a great way to change the soil composition long-term. We also share information about your use of our site with our social media, advertising and analytics partners. I want to make them blue in the future. Because they retain water, the coffee grounds can help to keep your soil moist in-between watering, which hydrangeas like. Flower buds typically begin to develop on hydrangeas that are two or three years old, depending on the species and cultivar. Amend the soil with coffee grounds to increase the acidity by digging it into the soil. Purchase an at-home soil test kit. It is better to work it into the soil. In particular, Hydrangea paniculata, Hydrangea arborescens, Hydrangea macrophylla, and Hydrangea macrophylla do particularly well in zones 6 through 9, although each has individual requirements for sun and shade. Do Hydrangeas Need Aluminum Sulfate & Weekly Fertilizers? So you might have blue flowers when you first purchase your hydrangea but with time they’ll turn to pink at which point you should start considering the integration of coffee grounds. I've heard that leftover coffee is also good for plants in the garden.Is this true as I always have leftover coffee. If you have incredibly alkaline soil, it’s going to take a lot of effort to produce even the slightest blue colour. It changes the ph of the soil and makes my pink ones blue. Used coffee filters can be composted as well. Coffee grounds are an excellent nitrogen source for composting. Alternately, dump your coffee grounds into your compost bin and add the compost as part of your twice-yearly fertilizing ritual for your hydrangeas. Hydrangea and it ’ s important to understand how the process works the dirt to... It easier for the plant to absorb naturally occurring aluminum in the soil again to if! Because they retain water, the coffee grounds also help retain moisture in the coffee grounds are close to neutral. Their... get the right plant them in with the blues, purples,,! 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