Not all plants benefit from the addition of coffee grounds; in fact, some can be harmed by them. It's crucial to know which plants to avoid to ensure a healthy garden.
Plants to Avoid Coffee Grounds On
Certain plants and trees react negatively to coffee grounds, primarily due to their preference for specific soil pH levels or their sensitivity to compounds released by the grounds.
Alkaline-Loving Trees
Coffee grounds are acidic and can lower soil pH, which is detrimental to trees that thrive in alkaline (higher pH) conditions. Applying coffee grounds as a soil amendment or mulch around these trees can inhibit their growth and overall health.
- Linden
- Ironwood
- Red Chestnut
- Arborvitae
Plants with Inhibited Growth
For some plants, using coffee grounds as mulch or incorporated into compost can actively hinder their growth. This inhibition can be due to various factors, including changes in nutrient availability or specific compounds in coffee grounds that affect these plants.
- Geranium
- Asparagus Fern
- Chinese Mustard
- Italian Ryegrass
For optimal plant health, it's best to steer clear of using coffee grounds with the varieties listed above. Always consider a plant's specific needs before introducing new amendments to their growing environment. For more information on using coffee grounds in the garden, you can consult gardening resources like HGTV.
Summary of Plants Not Suitable for Coffee Grounds
To easily identify plants that should not receive coffee grounds, refer to the table below:
| Category | Specific Plants |
|---|---|
| Alkaline-Loving Trees | Linden, Ironwood, Red Chestnut, Arborvitae |
| Growth-Inhibited Plants | Geranium, Asparagus Fern, Chinese Mustard, Italian Ryegrass |
