But be aware that only the "Hawaiian" or "Madagascar" variety work. The others (e.g. "African" or "Indian" ) have much less, to none ergolines.
Usually if they are not explicitly declared as these, then they're not, as there are way more of the other varieties.
I personally clearly favor Ipomoea Tricolor, as they can be grown locally almost anywhere, but everybody as he likes.
I claim not that this is the truth. As this is just what got manifested into my mind at the current position in time on this physical plane. So please feel not offended by anything I say.