"Erysimum mediohispanicum" produce tiny seeds (less than 0.5 mg) that are autochorously (by gravity) dispersed during August and September (about 40–60 days after pollination), when the valves of the dehiscent fruits (siliquae) open due to moving vegetation, wind rain or physical contact. Dispersal distance is very short in this species, just very few seeds travelling farther than 1 meter from the plant source. Seed dispersal distance is positively related to flowering stalk height, taller plants usually dispersing seeds farther.