Coffee grounds are generally not recommended for use on boxwood plants. While some people believe that coffee grounds can be beneficial for plants, it is important to understand that boxwoods have specific preferences and requirements when it comes to soil conditions.
Boxwoods prefer well-draining soil with a slightly acidic to neutral pH. Coffee grounds, on the other hand, are known to be quite acidic. If used in excess, coffee grounds can lower the pH of the soil, making it too acidic for boxwoods to thrive. This can lead to nutrient deficiencies and other problems for the plants.
Furthermore, coffee grounds can also affect the moisture levels in the soil. While boxwoods prefer slightly moist soil, excessive moisture can lead to root rot and other issues. Coffee grounds, when used in large quantities, can retain moisture in the soil, potentially causing harm to boxwoods.
In addition, coffee grounds can contain caffeine, which is toxic to many plants, including boxwoods. The caffeine content in coffee grounds can interfere with the plant’s growth and development, damaging the leaves and roots over time.
It’s worth mentioning that boxwoods are generally hardy plants that can tolerate a range of soil conditions. However, it is best to provide them with the optimal conditions to ensure their health and longevity. Instead of using coffee grounds, consider other organic materials like compost or well-rotted manure, which can provide the necessary nutrients without affecting the soil pH or moisture levels.
Personal experience: I have a small boxwood hedge in my garden, and I have always avoided using coffee grounds on them. Instead, I have focused on maintaining proper soil moisture and providing organic compost to nourish the plants. My boxwoods have thrived well without the use of coffee grounds, and I have not encountered any issues related to soil acidity or caffeine toxicity.