I've had Calatheas turning up in odd spots in my garden but this year I've noticed dozens of seedlings. It only seems to be Calathea metallica doing it. Don't know what their survival rate is but it looks like they may soon over run the place. There's Jungle Fowl that visit from time to time and rip up the garden, which might explain why many seedlings don't survive and why others are scattered all over the garden.

With all the scattered C. metallica plants in the garden now I guess the seedlings are true to their parent. It would be nice if the other species in the garden also produced seedlings rather than having only one species take over.