Impatiens are great bedding and container flowers that ought to bloom reliably all summer long. They’re an old standby for bright, full color.
Of all the possible reasons impatiens are not blooming, one of the most common is improper sun exposure. Impatiens plants bloom best with some shade, a requirement that often leads to misunderstanding.
While some impatiens bloom well in full shade, for the most part they’ll perform better with at least some sun. On the other hand, too much sun will cut down on blooming, too. Avoid planting your impatiens in full sun.
If you have them in full shade and they’re not blooming well, try moving them to a spot that gets a few hours of good afternoon sun exposure.
Another common cause of no flowers on impatiens is improper watering. If the roots of impatiens plants get waterlogged, the flowers will tend to drop off and the foliage will take on a red tinge. If you see this, cut back on your watering. Don’t cut back too far, though. You never want your soil to dry out completely.
Read more at Gardening Know How: Impatiens Won’t Bloom: Reasons For No Flowers On Impatiens Plant https://www.gardeningknowhow.com/ornamental/flowers/impatiens/no-flowers-on-impatiens-plant.htm