No, it is best to use coffee grounds that are left over from being brewed and cooled. Coffee grounds at room temperature may be better delivered from the saucer upwards to roots, rather than from on the surface of soil or compost at the top of a pot. Do not be tempted to put hot coffee grounds in a saucer or at the bottom of the container! They can take a long time to cool down, and you may damage roots as well as destroy some nutrients in the compost or soil.