Coffee Grounds In My Indoor Plants. You can use coffee grounds for your houseplants -- and gardening experts say you can compost them or add the grounds directly to the soil. This key mineral is vital to plants as it is a major component of chlorophyll the green pigment that plants utilise in order to conduct photosynthesis.
Rinsing your used coffee grounds can bring them to a safe pH level which wont affect the soil. Half a cup of coffee grounds mixed in a gallon of water makes a great liquid fertilizer for your plants whether they grow in the garden or in pots. Adding coffee grounds to your compost bin is also recommended.
The question is how acidic are coffee grounds once youve made your coffee.
High in nitrogen they can have a second life as a natural fertilizer and pest deterrent and are. Half a cup of coffee grounds mixed in a gallon of water makes a great liquid fertilizer for your plants whether they grow in the garden or in pots. Using one cup per week for plants like impatiens orchids dieffenbachia and African violets is a good way to help them grow well. Coffee grounds provide noticeable levels of nitrogen into the compost mix.