Yes, coffee grounds may be used as fertiliser, but don't overdo it and throw off the plants' natural balance.
TikTok user Armen Adamjan (@creative explained) teaches how to create houseplant fertiliser using coffee grounds, cinnamon, and club soda.
Coffee grinds enrich the soil. Cinnamon promotes root development, root health, and insect repellant for indoor and outdoor plants.
Carbon, hydrogen, oxygen, phosphorus, potassium, sulphur, and sodium are in club soda. These help plants look their best.
Most plants will benefit from less acidic spent coffee grounds after brewing.
Leftover coffee grounds combined with club soda and cinnamon can slow-feed indoor and outdoor plants.