Coffee grounds?

Coffee grounds?

Hi gardeners! I'm a complete novice who posted here once before about my scorchingly sunny balcony, and everyone was very helpful about what kind of plants I should try. I have planted some mediterranean herbs, and started some seeds for three kinds of flowering climbers that will hopefully adorn a trellis at the side of the balcony. I was so excited to see the shoots come up, and everything is growing wonderfully! Checking on my new shoots is the first thing I do in the morning. I'm going to buy lots of plants for this season (based on this community's suggestions from my other post), but next year I will definitely start more seeds, since my first forays have been successful. Here is my question: a friend of mine swears by using used coffee grounds as house plant "food." She has apparently rescued many a dying plant this way. This surprised me. Has anyone found this to work? Does it work for any kind of plant? Concretely - is there any benefit to putting coffee grounds on my newly sprouted nasturtiums, sweet peas, flowering bean vines, or herbs? It seems like a good way to use something I'd normally throw out, but I thought I'd ask before I tried it. Be kind, I have no idea what I'm doing :)
Christmas Frou-Frou

Christmas Frou-Frou

Garden pictures and questions

Garden pictures and questions

Iris, unfurling

Iris, unfurling

My garden in June

My garden in June

Calendula

Calendula

Pest or not?

Pest or not?