Pre-Sowing Magnetic Exposure Enhances Early Seedling Growth but Not Germination in Two Salvia Species from Michoacán, Mexico

The propagation of native plants that support pollinators is a relevant strategy for strengthening seed banks, pollinator gardens, and local restoration efforts. This study evaluated whether pre-sowing magnetic exposure modifies germination, early survival, and initial seedling growth in two Salvia species with ecological and biocultural value from Michoacán, Mexico. A total of 1000 seeds, equally distributed between both species, were analyzed. The seeds were assigned to a non-exposed control group and magnetic field exposure treatments at 83.94, 166.94, 292.30, 305.40, 350.70, or 375.10 mT for 5, 10, 15, or 20 min. Germination, survival, time to radicle emergence, and seedling height on day 13 were recorded. Although magnetic exposure did not significantly increase germination, seedlings from exposed seeds were taller on day 13 than those in the control group. Furthermore, higher seed mass increased germination probability. These results suggest that magnetic exposure cannot be considered a direct strategy to increase germination in these species but could be explored as a complementary tool to promote early seedling growth in native plants intended for conservation, environmental education, and restoration.