There’s a quiet park on the edge of New Haven, just before Hamden, called Edgerton. If you haven’t yet discovered them, go and find the greenhouse and botanical gardens. They’re unexpectedly lush and beautiful.
The G.R.O.W.E.R.S., Inc. program based in the greenhouses there teaches adults with development disabilities to care for and grow plants of all kinds. Many are for sale, see if you can resist taking an armful home for your own gardens.