Angel trumpets (of the Brugmansia family), with their long, trumpet-shaped flowers, are often confused with datura. Both have similarly shaped flowers, but the datura's are more stout and erect. The basic telltale difference is in the seed pod. Datura have round, spiky pods, whereas Brugmansia have long, slender, okra-like pods. Propagating an angel trumpet seed pod is quite easy with both varieties, and the success rate is quite high. Planting the seeds is relatively basic--within no time, you should see your new seedlings emerging from the soil.
Wait until spring to propagate your angel trumpet seeds, when cold weather has left your region. Store seeds picked earlier in the year in the refrigerator until you are ready to plant them.
Allow the seed pod to completely dry out before planting. The outer shell will become dry and split open when the seeds are ready. Allow the pod to either dry out on the tree or pull it off when it is almost mature, and allow it to dry out off the tree.
Remove the flat, yellowish seeds from inside the pod and lightly nick the seed with a knife. Place the seeds into a bowl or jar of water and allow them to soak overnight.
Fill a 4-inch container with a potting mix that drains very well. Do not use a heavy potting soil (which will retain water), or the seeds can rot before germinating. Water the container to settle the mix.
Make a 1/4-inch indentation in the soil with your finger. Place a seed in the hole and cover it lightly with soil. Water the container again.
Place the container in a warm area that will receive partial sun. Keep the container's soil moist but not flooded. The angel trumpet seeds should start to germinate in two to four weeks.
Transplant it into a larger container, or into a place in your landscape, once the seedlings have established themselves into their original container.