I have 3 miniature roses and I'm having trouble with where to plant them. The 3 minis are a Pink Pixie Rose, Magic Carrousel and Carnival Parade. I am putting a small round bed around a small bird bath in front of my raised rose bed. This round bed will be 4 feet across with the bird bath in the middle. Would this bed be big enough for these 3 miniature roses. I am not sure how big these minis will get and would't want them to hide the bird bath. Anyone know how tall these 3 will get? The are in 4 inch pots right now, so they are very small.