To keep things simple, we'll go ahead and say snow-on-the-mountain has white flowers even though the white parts are actually bracts and leaves. This showy, unusual annual is related to the familiar Poinsettia. It contains a milky latex that discourges herbivory but can also be a skin-irritant.
Bloom time: June - October
Height: 1 to 3 feet
Space: 1 to 2 feet
Sun: Full sun to light shade
Moisture: Dry to average