Depending on your climate, they might not come back from seed (outdoors)
I had dozens of Morning Glories growing last season, planted from store-bought seeds.
they all grew great and made billiions of seeds.
a few seeds fell to the gound naturally last autumn, but the majority stayed in the seed pods all winter...the seed pods stayed on the plants all winter, exposed to the winter air.
about a month ago..maybe even 6 weeks ago, I tore down all the dried dead vines from last season, popped open the hundreds of seed pods and put the seeds back into the ground, hoping to grow a new crop of M.G's this year...NO seeds have sprouted!
not one..
I can only conclude that the winter not only killed the vines (which ws expected..they are considered annuals in this climate) but that winter ALSO killed the seeds!..the seeds froze to death.
either that or they take a REALLY long time to germinate...but they should have sprouted by now..
If none sprout in the next few weeks, I will buy more store-bought seeds and plant those..
Then! this autumn before a deep freeze, I will collect a bunch of seed pods and store them with my CPs..a winter dormancy just above freezing,
then see how the seeds do that way next spring.
Scot