8 Do Coffee Grounds Hurt Birds : 5 Secret Tricks For Getting Great Results. Coffee grounds can successfully be used in indoor and outdoor gardens, but moderation is key. Coffee grounds do contain residual caffeine, and this caffeine inhibits both seedlings and mature plants from growing as they should.
So to answer do coffee grounds repel. However, coffee grounds alone may not be enough, and you may have to call for additional help from a local pest removal company. Tomatoes, like potatoes and other nightshades, have a tasty fruit that is fine as a treat for your bird.
