Steeped tea mixed with water will bring out the green in plants. Roses also enjoy a drink of tea in mid summer. And in the British tradition, usually around 4 pm.
Lemon balm, marigolds and catnip will repel mosquitoes. Coffee grinds have a neutral pH and acts as a soil conditioner as well as attracting good earthworms .
Toad houses ( clay flower pots upside down with a hole punched in the side) and a pan of water nearby will encourage toads to stay in the garden. Each toad will eat about 10,000 insects in 3 moths... plus lots of slugs.