Pick growing containers with good drainage that will fit windowsills or plant stands.
Combine two parts sterilized potting soil with one part coarse sand in a large tub or bucket. For example, you would need 10 lb. potting soil and 5 lb. sand to make the mixture.
Fill the growing containers 1 inch deep with pebbles or glass beads.
Fill the container to within 1/2 inch of the top with the potting soil mixture.
Water the mixture until water drains from the bottom of the container.
Sprinkle the medicinal herb seed of your choice over the moist surface of the soil. Cover with additional soil as directed on the seed packet for depth.
Cover the containers loosely with a sheet of plastic wrap. Remove the plastic when the seedlings emerge from the ground.
Place the containers on a southern or west-facing windowsill or plant stand beneath the window.
Water as needed to keep the soil moist to the touch. Turn the plants every few days in the window to keep the plants growing straight.
Apply a general purpose organic fertilize to the medicinal herbs every three months following label instructions.