What plants can I use coffee grounds on indoors?
From Peace Lilies to Pothos, the right application of used coffee grounds can lead to lusher foliage, more vibrant blooms, and an overall healthier indoor garden. Coffee and coffee grounds are acidic and, while there are some plants that love an alkaline soil and won’t do well with the addition of coffee, such as lily of the valley, lavender and honeysuckle, some plants absolutely thrive in an acidic soil.If you add coffee grounds to the soil in a thick layer, they will be compacted into a crust and be nearly impermeable to water. But if it is incorporated into the soil, they greatly improve both the texture as well as the organic content. Being slightly acidic, coffee grounds lower the pH of the soil.However, there are some plants that you should avoid using coffee grounds on. Plants that prefer alkaline soil, like lavender and lilacs, can be harmed by the acidity of coffee grounds. Plants that are sensitive to caffeine, such as geraniums and some herbs, can also be affected by the presence of coffee grounds.Instead of throwing spent coffee grounds in the trash, some homeowners leave piles or lines of coffee grounds around their gardens and homes to keep flies, mosquitoes, and other pests away. Coffee grounds are also often used to deter slugs and snails, reduce weeds without chemicals, and even repel neighborhood strays.
Which plants don’t like acid?
Soil pH determines how easily your plants can take up nutrients from the soil around them. While many garden plants are adapted to a fairly wide range, certain plants—like azaleas, rhododendrons, hollies, and blueberries—are fussy about having acidic soil. Popular plants such as azaleas, rhododendrons, blueberries, strawberries and heathers, are all acid-loving, meaning they need a soil pH of about 5.
What plants like coffee grounds and how often?
Which plants benefit from used coffee grounds? Coffee tends to be slightly acidic and is therefore good for acid-loving plants such as hydrangeas, as well as nutrient-hungry plants like roses, but again, use it only in moderation on any one plant. Not ALL plants love coffee grounds. While coffee grounds work wonders for some plants, others—like lavender, rosemary, and succulents—can suffer from the acidity and moisture retention.Plants That Don’t Like Coffee Grounds Similarly, tomatoes may suffer if the grounds are added directly, especially in large quantities, as it can disrupt pH and introduce too much nitrogen. Other plants that struggle include clovers, alfalfa, and some flowering annuals like geraniums and petunias.