In a word – coffee grounds. Most plants love them – I’ll do some checking to find out what *doesn’t* like the acid in coffee. But most do.
Scatter the grounds as mulch. Dig them into your soil to both lighten and enrich it.

add coffee grounds to your garden - as mulch, as food, as compost - it's all good
And definitely add them to your tomatoes. Yum yum. Happy tomatoes.