Brugmansia seeds can take from two weeks to several months to sprout, so if you don’t see results right away, don’t give up in despair.
To grow Brugmansia from seed, you would follow standard seed-sprouting protocol. Begin by soaking the seeds overnight in warm water to soften the outer hull and hopefully create a split that will help the seed sprout faster and with greater ease.
Prepare a seed tray or small pots with pre-moistened, well-drained potting soil or seed-starting mix. When planting, take care not to bury the seeds deeply. They need exposure to light to germinate. You can either press them gently into the surface of light, airy soil or cover them very lightly.
Sow the seeds indoors early in the springtime. Cover the trays or pots with plastic wrap and keep them in a warm (65-70 degrees Fahrenheit) place with good natural or artificial light. Keep them carefully at temperatures of 60-70 degrees Fahrenheit.
Germination should take 2-4 weeks, but sometimes it takes much longer. If all goes well, you should see results in a couple of weeks, but remember to be patient.
Months could elapse before your plants emerge. Just keep your hopeful plants warm and provide them ample light and consistent moisture.