I have never had them cross on their own in my collection. I've even had the bloom stalks laying against each other, with bees all over them, and have not had seedlings showing characteristics of both Jovis and Semps.
There are some crosses between the J. roller types and J. heuffelii, but even that is not common.
Maybe Kevin know of some Jovi/semp crosses.
@JungleShadows.
