Coffee grounds are also very high in nitrogen; making them an iffy amendment for flowering plants, as too much nitrogen will make plants grow abnormally large, but inhibit the number of blooms. Hydrangeas If your Growing Hydrangeas that the bloom color is affected by soil Ph, sprinkle coffee grounds underneath the shrub and you'll enjoy the most dazzling blue blooms you've ever imagined. develop best in USDA zones 5b through 9. You can if you want, but I doubt it'll be of much value to your azaleas. The nitrogen in coffee grounds also raises the temperature of the soil, which can kill weeds and curb pests. I have been collecting coffee bean grounds for the last week and want to know if I can just dump them around the soil of my potted azaleas. Surprisingly, an excellent source of acid is your very own coffee grounds. © Copyright 2020 Hearst Communications, Inc. Azaleas produce some of the most stunning blooms in the plant world. Coffee grounds provide a natural means of maintaining the low pH levels azaleas prefer, particularly if alkalinity is a concern. There has been concern over the specific process used in decaffeinating the beans. Coffee grounds have a soil pH of 6.2, which is slightly acid, making it a perfect choice for azaleas. Whether the grounds are mixed with the soil or scattered around the plants, the effect will be positive. https://homeguides.sfgate.com/azalea-care-coffee-grounds-47025.html For this reason, they can be employed as an excellent natural compost , especially for plants that love acidic soils, such as azaleas, hydrangeas, rhododendrons and camellias. Coffee grounds are highly acidic, so spread them generously over the flower beds of acid loving plants, such as azaleas, rhododendrons, and Hydrangeas, for amazing blooms! The nutrients contained in both caffeinated and decaffeinated coffee beans are alike, so it doesn't matter which type of grounds you use on your azaleas. Soil should drain well, because waterlogged conditions encourage disease development and may result in plant drowning. Azaleas need a more acidic soil. Coffee grounds provide a natural means of maintaining the low pH levels Autumn Sunburst Azalea Shrubs prefer, particularly if alkalinity is a concern. Whether you are composting with coffee grounds or using used coffee grounds around the yard, you will find that coffee can give your garden as much of a pick me up as it does for you. Azaleas thrive in areas of the garden that offer partial shade, whereas extended exposure to full sun may result in damage and susceptibility to pests. Providing good general care for azaleas protects them from pests and diseases, because healthy plants have a higher capacity to avoid problems than do weak plants. - Needles and small twigs: four inches. A few varieties, however, do well in sun. Coffee grounds, in fact, are rich in nutrients such as calcium, nitrogen, potassium and magnesium, essential for fertilisation. They need soil that is acidic in order to thrive and produce brilliant blooms. This induces the growth of mold. In most cases, the grounds are too acidic to be used directly on soil, even for acid-loving plants like blueberries, azaleas and hollies. There are over 10,000 hybridized types of azaleas. If planted in direct sun, make sure the azalea is only exposed for four to six hours. If you’re a coffee drinker, there’s one day each year to honor your favorite morning drink: National Coffee Day. Azaleas grow best in moist soil with good drainage. Gardeners should always grow plants in their preferred U.S. Department of Agriculture hardiness zones for best performance. For the most accurate results, home gardeners should retest their balanced soil with an at-home soil pH kit immediately before applying amendments. 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