Crackerjack is the variety of marigold I have. I like that it's tall, so I can see it and not step on it when I'm working in the garden. I use my own saved seed and start them early.
I'll have to look into Portulaca. If
@cavemanrich can grow it, I should be able to.
I found out this spring how tough marigolds are. I planted 3 seeds in each pot, and this time, ALL of the seeds grew! I decided I'd try to separate the plants in one of the pots, knowing that the roots would all be tangled together. The marigolds didn't seem to mind me separating them, even though I had to tear the roots apart! So I did the other pots, and every single plant said, "eh, I can handle that. No biggie."