Digitalis from purple to pink, white, and yellow. The best-known species is the common foxglove, "Digitalis purpurea". This biennial plant is often grown as an ornamental plant due to its vivid flowers which range in colour from various purple tints through pink, light grey, and purely white. The flowers can also possess various marks and spottings. The first year of growth produces only the stem with its long, basal leaves. During the second year of the plant's life, a long, leafy stem from 50 to 255 centimetres tall grows atop the roots of healthy plants. Other garden-worthy species include "D. ferruginea",
Radioactive contamination from the Rocky Flats Plant of substantial contamination from the 1957 plutonium fire until after the highly visible 1969 fire, when civilian monitoring teams confronted government officials with measurements made outside the plant of radioactive contamination suspected to be from the 1969 fire, which consumed hundreds of pounds of plutonium (850 kg). The 1969 fire raised public awareness of potential hazards posed by the plant and led to years of increasing citizen protests and demands for plant closure. Releases from previous years had not been reported publicly prior to the fire; airborne-become-groundborne radioactive contamination extending well beyond the Rocky Flats plant was not publicly reported