Preserving Flowers As evidenced by the discovery of preserved flowers in ancient Egyptian tombs, people have for centuries engaged in the art of preserving flowers. Today, a large variety of annuals, biennials and perennials are successfully preserved. Because properly dried flowers can persist for years after harvesting, they are often referred to as everlastings or immortelles. To ascertain the optimum growing conditions and harvesting time for a particular species, one should not rely solely on books or articles. Experienced growers will frequently be the best sources of information. In general, flowering plants require ample su