Annual flowers grow for one long season, often into the fall, then die with the onset of freezing weather.
With perennials, the above-ground portion of the plant dies back in freezing weather, but re-grows from the base and rootstock the following spring to bloom again.
Ornamental trees are grown for their aesthetic value and the sheer enjoyment of having them in the garden. They may have outstanding flowers and fragrance, an interesting shape, colorful or unusual bark, excellent fall color, or a combination of these and other features.
Natural Privacy is commonly achieved with Emerald Green Arborvitaes, giving a dark green color year-round.
Use blooms instead of fences to enclose your yard, for a softer more prominent look.