Collect the red/yellow/orange berries from an American bittersweet plant (not the Oriental variety). The berries contain seeds for planting. You can also purchase bittersweet seeds from an online or local nursery.
Dry the seeds out. To do this, spread them out on a flat, shallow pan (such as a cookie sheet) and wait for two weeks or until dry.
Collect the seeds from the dried out fruit and allow the seeds to set for another week in order to ensure they are fully dry.
Plant the dried seeds in a container of peat moss. Keep the moss moist and refrigerated between 31 and 41 degrees for three months.
Wait until mid spring after any potential for frost has passed. Then, locate the sunniest area of your yard away from other trees.
Sow the seeds by sprinkling them in your selected location. Cover with a thin layer of mulch. You can mix in compost, peat moss and/or fertilizer to create a healthy, nutrient-rich environment for your bittersweet.
After the seeds have germinated and matured, thin the seeds back to 12 to 36 inches apart. Continue watering to keep the young bittersweet moist and healthy.