Q.Yellow leaves on Brugmansia
My container Brugmansia has just started to bloom on my outdoor patio here in southern VA, which looks and smells incredible. However, some of the leaves are turning yellow and some fall off after turning. What does this mean? I try to water the plant at least once a day (or every other day) now that it is not so hot (mid to high 60s). Is this normal? The flowers look healthy and strong, just the big leaves are yellow.
Your potted Brugmansia may still be needing more water to be happy.
Check the soil to make sure it is nice a moist each day.
There are some possible diseases or insect issues so I'm listing these links also.
Your plant also may be starting it's winter dormancy as the weather cools and daylight is lessoning.