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If you have access to an adult Angel Trumpet plant, harvest 1 of its seed pods after the pod turns brown or yellow. Then, carefully peel off the pod's skin using your fingers, exposing lots of small seeds. If you don't have access to an adult plant, purchase a pack of Angel Trumpet seeds from a gardening supply store. When you're ready to plant your seeds, fill a small bowl with warm water and place the seeds inside. Let the seeds soak for about 24 hours, then dry them off with a clean towel. Soaking your seeds will remove the thin layer of pulp surrounding them. If you leave this layer on, they may not germinate properly. Grab a small paper towel sheet and dampen it with warm water. Then, spread your seeds out evenly on the paper towel and fold the sheet up into a tight package. Try to use sheets that are about 4in (10cm) long. If you have a lot of seeds, you may need to use multiple sheets. Grab your moistened paper towel package and slip it into a resealable plastic bag. Then, seal the bag. You do not need to press out any excess air before closing the bag. If you have multiple paper towel packages, make sure you use a different plastic bag for each of them. To make sure your seeds germinate properly, place them in an area that has a constant temperature between 60 and 70F (16 and 21C). Remove your seeds from the bag once they develop small, white stem strands, an indication that they've successfully germinated. In most cases, your seeds should take between 3 and 4 weeks to fully germinate. You can remove your seeds as soon as you see their stem strands. You don't have to wait for them to grow to a specific length. When left unchecked, your germinating seeds can develop mold or become fungal. To prevent this, replace the damp paper towel once every other day.

Summary:
Acquire Angel Trumpet seeds. Soak the seeds in warm water for 24 hours. Wrap the seeds in a moist paper towel. Seal the seeds in a plastic bag. Store your seeds in a warm place until they germinate. Replace the paper towel every other day.