Spring flowering bulbs are planted in the fall. They require a freeze and period of dormancy -- when the spring thaw comes, they will be among the first to bloom and provide early season color in your garden, while your other plants are still developing. Because they can withstand (and even require) a frost, they are often referred to as hardy bulbs.

Some popular spring flowers are:

Tulips, Crocuses, Hyacinths, Irises and Daffodils or Narcissi

Tropical flowers normally grow in warmer region of earth. In US they often found in Hawaii, Florida and other warm weather states. Tropical flowers tend to live longer than other kind of flowers.

Some popular tropical flowers are:

Anthurium, Bird of Paradise, Ginger, Pineapple, Pincushion Protea, Pink Mink Protea, Calla Lily and Calla Lily Mini

Roses are probably the most popular flower in the country. Roses are usually classed into two general categories according to their habit of growth-- bush roses and climbing roses. The following classification is taken in part from "Roses for the Home," (Home and Garden Bulletin No. 25, USDA).

Some popular types of Roses are:

Bush Roses, Hybrid Teas, Floribunda, Grandifloras, Tree Roses and Climbing Roses

Exotic flowers often names as rare flowers because they grow in difficult conditions and not found easily. They can be found in blistering deserts, remote tropical rainforests or on little known places on earth's primordial continents. A typical example of exotic flowers are Orchid's and Tulip's.