Grow sage indoors from seed starting in March. Fill a pot with potting soil, and then place a handful of seeds a few inches apart on top of the soil. Punch each seed about 0.75 inch into the soil with your finger. Water the seeds then, but do not water them after that.
Transplant the sage plants from the indoor pots to an outdoor garden at the end of April or May. Dig a small hole in the ground, and mix a handful of bone meal with potting soil; then add the other dirt from the hole. Pull the sage from the pot, and insert the roots into the hole.
Cover the sage plants' roots with the soil mixture, and then water it. Make sure the plant gets sunshine at least twice a day for an hour or more each time.
Prune the old leaves in the fall. Allow the plant to go dormant through the winter, and then wait for it to revive in the springtime.