Henry Augustus Siebrecht (1849 – June 19, 1934) was a German immigrant to America who used his early horticultural training to become one of the top floral designers and horticulturalists in the United States. Siebrecht is credited with having been the first florist to grow lilies of the valley in the winter in a greenhouse process he introduced in 1889. He was also credited with bringing the orchid into commercial use, which he introduced into wedding bouquets in the 1870s, and bringing Japanese and Chinese ginkgo trees into popularity.