If you add coffee grounds you can naturally make your soil a bit more acidic and as a result, you can produce blue blooms. If you want to use coffee grounds in your potting soil, they will serve as a homemade fertilizer. One way is using coffee grounds on hydrangeas. Flower buds typically begin to develop on hydrangeas that are two or three years old, depending on the species and cultivar. Yes, that’s a bit of foreshadowing, keep reading. Another option would be to place them in a cup, add a bit of water, give them a quick stir and then pour the mixture onto the soil. Coffee grounds are one way to create soil that supports the growth of more unusual-colored hydrangea blooms. Place a bowl of dry grounds in your refrigerator or freezer to neutralize odors … There are several ways to remove the darker coloring from coffee grounds that many people assume does not make the substance look blue. Use decaf grounds instead. The solution is to mix coffee grounds with other organic matter such as compost or leafmold before using it as a mulch. One way is using coffee grounds on hydrangeas. We recommend using about a teaspoon of coffee grounds per gallon of water and adding it to a small container. For example, you can combine coffee grounds with soil, compost or fertilizer. I wouldn’t suggest putting fresh coffee grounds on plants to acidify your soil either. All hydrangea blooms respond to increased acidity in the soil, though the soil must still be fertile and drain well. Once you have your test results change your soil with coffee grounds by digging it into the soil. This works especially well camellias, hydrangeas, and roses. Pour extra coffee left in the pot straight into ice cubes trays. On a chemical level, this increased acidity makes it easier for the plant to absorb naturally occurring aluminum in the dirt. It is mandatory to procure user consent prior to running these cookies on your website. Used coffee grounds are good for plants and soil. These cookies will be stored in your browser only with your consent. If you’re itching to experiment and want to try using coffee grounds in your garden here are a few ways to source spent grounds. If the soil is more alkaline, above 6, the aluminum is not absorbed. It is better to work it into the soil. The dark-colored coffee we buy from a store does make hydrangeas blue, but the coffee that is ground does not make it appear blue. Using coffee grounds as fertilizer. 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. But this is only applicable to certain varieties. Turning the flowers blue with coffee grounds isn't necessarily a quick process. Used coffee grounds come in with a pH of 6.5 to 6.8. It changes the ph of the soil and makes my pink ones blue. We never sell your information. Some hydrangeas grow flowers on last year's growth, other hydrangeas grow them on the current year's growth. The effect is pretty blue clusters of flowers. (Heh, pH humor.) Should you use coffee grounds for hydrangeas Using coffee ground on hydrangeas. I love to garden. Hydrangeas are well known for their globular blooms and with rich soil you can even alter the colours you get. These products can then be given to plants such as the following, to boost their growth: I always save coffee grounds and tea bags for mulch around my hydrangeas. #fertilizer #coffee #coffeegrounds Coffee grounds acidify the soil and help to turn your flowers blue. If you rinse your used coffee grounds, they will have a near-neutral pH of 6.5 and will not affect the acid levels of the soil. Coffee grounds are highly acidic. Necessary cookies are absolutely essential for the website to function properly. Use coffee grounds on other plants. A mix of used coffee grounds and wood ash is also fine. 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