I found the easiest way to get both of those was to wait until a peep asked for them as a favor. I've seen them flitting around other times since then but I'm pretty sure my initial catch (i.e. museum specimen) for both was cheating a peep out of what I said I'd get for them.

I'm not sure they prefer one type of flower. My memory impression of them is in flight, going from one flower bed to another one.