It is probable that seed protected by overlying layers of soil can survive at least some fires. Wild ungulates generally eat only trace amounts of common juniper, although it can be important in some areas. Native Americans from the Pacific Northwest used tonics made from the branches to treat colds, flu, arthritis, muscle aches, and kidney problems. Indigenous peoples from Eurasia made tonics for kidney and stomach ailments and rheumatism. Common juniper extract, which can be fatal in even fairly small amounts, was used to make gin and as a meat preservative.
Seed usually matures during the second growing season.
Germination rates are relatively poor. Defective seed may also be relatively common Produces large fruit crops at irregular intervals. Fruits are ovoid to ellipsoid and contain one to three seeds. Fruit generally remains on the plant for at least 2 years, with dispersal in August of the second season. Seed dispersal by gravity, water, birds, or mammals.