Factors influencing germination and emergence of Florida beggarweed (Desmodium tortuosum)

Florida beggarweed germination in laboratory experiments was highest between 21 and 38 C and at osmotic potentials above -0.2 MPa, with complete germination inhibition below -0.8 MPa. Patterns of seedling emergence in the field corresponded to timing and size of rainfall events in relation to the time of soil disturbance. Smaller percentage total seasonal emergence was observed following large rainfall events where soil had not been disturbed compared with plots recently disturbed, and soil disturbance not followed by rainfall did not promote major weed flushes.