The BBCH-scale (weed) identifies the phenological development stages of weed species. It is a plant species specific version of the BBCH-scale.
D = Dicotyledons
G = Gramineae
M = Monocotyledons
P = Perennial plants
V = Development from vegetative parts or propagated organs
No code letter is used if the description applies to all groups of plants.
References
BBCH-scale (weed) Wikipedia(Text) CC BY-SA