[MnGirl]

Two plants will bloom all year, the Knock Out Rose, and the Bush Daisy. They may not have as many flowers in Jan. & Feb., but, as soon as the sun warms them up they are blooming again. Both very hardy, I don't think you can kill them.
These two plants can grow to more than 3 feet. If you want them to look nice and full, I recommend, you keep them trimmed to no more than 2 feet. The more they are trimmed the more they bloom. Remember... No trimming in the frost!
Walter Vibernum is a nice shrub, and will stay a beautiful green all year and bloom a lacy white flower in the fall. If you mix them with the Indian Hawthorn (another low shrub), you will have flowers from March until Oct.