Sorry I didn't answer your post sooner I was actually waiting to see if anyone was familiar with your plant.

I am not familiar with indian pink but I did do a search for your plant just a simple search that is and I used the botanical name. You can collect your seeds by bagging the seedhead. The seedhead is found where the bloom was.

Sorry I couldn't post the link for you but if you do a search for the botanical name you should find more info.

Would anyone be able to trade or sell seeds/plants of Spigelia marilandica?

Thanks,
Steve