Getting sick of psychoanalysis? Try plants. McDonald, Garden Editor of House Beautiful, recommends developing a green thumb to cure your blues. Nurturing and tending living greenery will calm your nerves, alleviate office anxiety attacks, make you feel more whole. Not only McDonald but experts at the Menninger Foundation are promoting ""horticultural therapy."" A new leaf or bud is a visible, tangible reward--it promotes confidence, a feeling of achievement. We would say a lot more--but the philodendron needs watering and the Swedish ivy wants repotting.