Pot crops meant to be enjoyed then thrown away

Produced by the millions

Millions of plants are produced each year in the U.S. as pot crops. In 2006, for instance, the total was over 168 million. Poinsettias were the largest component of that crop, at 41 million. Hollies are  a minor component, with a few hundred thousand grown and counted in the category "other," which totals 51 million flowering and foliage plants.

Care to guess...?

Which four of the following plants join poinsettias to comprise the top 5?

The candidates are: Roses, African violets, spring bulbs, lilies, mums, azaleas, orchids

Check your guess.