Morning Glories: Have you considered the graft ? doctor !, 0 by dany12

dany12 wrote:
In principle, for me it would be possible. But there is a natural cycle plant has complied with - for me, leaves are making reserves in the potato then dry season arrives, the foliage disappears the plant is at rest and start again with the next rainy season.
Or should keep the plant green all year.

http://www.mykz.affrc.go.jp/Old/Gyoumu/page2.htm
I found this site in Japan - Google Translates is nice but with the Japanese language it is not the best!
Me this is what I understand:
To produce new varieties of sweet potato (rare flowers, incompatibility) we must be passed by the stage of graft (ATTENTION ! Sweet potato on Ipomoea Nil)
This would make the flowers fertile.

Do you understand this too?
Now we know how to produce quantity of seeds with Ipomoea Indica!