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    285 Ogden Avenue, Jersey City, New Jersey, NJ 07307 |  riverviewcommunitygarden@gmail.com |

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    About coffee grounds

    May 19, 2017

     

    Although coffee grounds are widely believed to be an acidifying agent when added to garden soil, the pH of grounds usually tends to be closer to neutral. That is not to say that coffee grounds are not useful in the garden. While they may not increase soil acidity, coffee grounds are a rich source of fatty acids, essential oils and nutrients that enrich soil. The types of plants and shrubs that benefit from using coffee grounds in the soil depends on the way the grounds are used.

    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.
     

    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.
    Nevertheless they're often used on acid-loving plants like azaleas, rhododendrons, blueberries ... and tomatoes. Be careful, however, not to overload tomatoes with too many coffee grounds. Tomatoes like slightly acidic soil, not overly-acidic soil. Used coffee grounds have a pH of about 6.8.

     

     

     

    Why Plants Like Grounds

    Although the grounds do not generally alter the soil's pH, they do improve soil texture and drainage. Additionally, as coffee grounds decompose, they release nitrogen, potassium, phosphorus and other minerals that support plant growth. Some examples of plants that thrive in a nitrogen-rich planting area include leafy vegetables such as spinach, tomatoes, corn, roses, camellias, rhododendrons and azaleas. As a bonus, coffee grounds are reputed to have a deterrent effect on garden pests. According to "The New York Times 100 Gardening Questions and Answers," using coffee grounds as mulch may help repel pests including squirrels and rabbits from damaging vegetables such as beets, broccoli, beans, peas or lettuce.

     

     

     

    Work Grounds Into the Soil

    Maximize the benefits of the grounds by adding nitrogen fertilizer to the soil at the same time. Coffee grounds release nutrients as the fungi and bacteria in the soil break them down, a process that can take several months. In the meantime, it’s helpful to have a supplemental fertilizer in the planting area to support plant growth while the coffee grounds decompose. “The New York Times 1000 Gardening Questions and Answers" recommends using no more than 6 pounds of coffee grounds for every 100 square feet of planting area. Coffee bean compost has been found to be a substitute for peat moss when growing anthurium plants.

     

     

    Use it as Mulch

    Although using grounds topically can be helpful in deterring pests from the garden, it can also have a downside. Aside from the potentially repellent odor of decomposing wet coffee grounds, using thick layers of coffee grounds as mulch can act as a barrier to moisture and air movement. We recommend using no more than 1/2 inch of coffee grounds topped with another type of organic mulch such as wood chips. Mulches and compost made with coffee beans enhanced sugar beet seed germination and improved growth and yield of cabbage and soybeans, she writes.

     

    Add it to Compost

    Because of their rich nitrogen content, coffee grounds are ideal for adding to the compost pile. Oregon State University Extension recommends using equal parts of coffee grounds, leaves and fresh grass clippings to get an optimal balance. Using more than 30 percent coffee grounds can have harmful effects on the compost mixture. We recommend using 10 to 20 percent coffee grounds to create the ideal compost. Additionally, compost made with coffee grounds may have antimicrobial activity that suppresses certain fungal diseases on vegetable crops such as cucumber, beans and tomatoes.

     

    Plants That Don't Like Grounds

    Although most plants benefit from the nutrient boost associated with adding coffee grounds to the soil or compost, some plants may be harmed by the addition. Exposure to coffee grounds has caused inhibited seed germination and stunted plant growth in plants including white clover (Trifolium repens), alfalfa (Medicago sativa), Chinese mustard (Brassica juncea), inch plants (Tradescantia albiflora), asparagus fern and geraniums.

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