Plant some cinnamon or chocolate-scented geraniums! They bloom like crazy in the fall and winter, and just pinching a leaf releases the powerful feel-good aroma of cinnamon or chocolate. Research at Wheeling Jesuit University found the scent of cinnamon instantly boosts alertness. And other research shows the smell of chocolate stimulates the happiness center of our brain.
Geraniums grow the best on a super-sunny windowsill. But they’ll do just fine if you shine a desk lamp with a fluorescent bulb on them for at least 4 hours a day.