When you say "angel trumpet" I'm thinking you are talking about Brugmansia.* Common names can be confusing as there can be several plants with the same common name.* I don't know where Roselle, USA is, but 'Brugs' are native to the Andes Mtns where the climate is not like any in the US.* This site has some interesting info about Brugs, their growing needs and the different flower forms.* At this first page scroll down to 'Brugmansia Flowers' and start reading from there.
Lots of Brug and Datura info here.
I've not heard of growing moon flower from sprouts, but I'm thinking you are growing Ipomoea alba, an annual vine with white flowers that bloom at night for just one night each flower.* You don't say when you planted the seed, but these plants tend to start blooming in July.* Too much nitrogen from fertilizer and you'll get lots of vine and few flowers.* Have you been fertilizing them?
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.