Trimming and free trimming methods were evaluated on carrot seed production. The characteristics in relation of seed yield/umbel and seed/plant and umbel/plant were determined in greenhouse conditions at Tsukuba International Agricultural Training Center - Japan. The influence of trimming and umbel position on the physiological quality of seed produced was evaluated through 1,000 seeds weight, germination percentage and vigor tests (seedling emergence, first count of germination, fresh scedling weight, dry seedling weight, root lenght and electrical conductivity) in laboratory conditions at Universidade Federal de Pelotas, RS. The analysis of data allowed to conclude that physical and physiological quality varied according to production method and umbel position; the vigor tests were more efficient than germination test to evaluate physical and physiological quality; the root lenght test subdivided the seeds on three vigor categories allowed the characterization of different seed quality levels.