Here are some links that provide interesting information about flowers and plants:
1) Stiftung Naturschutz Hamburg (nature conservation foundation) and Stiftung Loki Schmidt zum Schutze gefährdeter Pflanzen (foundation for the protection of endangered plants). Blume des Jahres (Flower of the year), a flower of the year is presented every year
3) gartenzeitung.de: The portal for flowers and plants. Roses, tulips, carnations - all flowers speak. Winged words with flowers are an integral part of our language. The symbolism of the flower language.