Growing a Frederick edulis from seed may not be true to the parent. Don't know about purple. Make sure it is not invasive.

True about Frederick not being true to the parent. Still I wonder how it tastes in comparison to the Possum Purple. These will be container plants, though you're right that it can be invasive.

I found container passion vines take a lot of water. I learned the hard way about invasive passion vines. Both in the ground and in containers.

Really? Even in containers? I'll be growing the passion vine indoors (limited outdoor space and I'm in zone 6). I sort of thought the growth of the passion vine would be limited by the container size. Good to know about the water.

I have the Frederick (from Annie's Annuals, so I'm sure that's the correct name.) It's about 5 years old and producing some fruit now - though not enough for me as I love it so much! It has the exact sweet/tart flavor I expect from visiting Hawaii, and eating things made from passionfruit. I would not want it more sweet. I am trying to order more, but it's out of stock all over. I am considering getting a Purple Possum, but not sure I will like the fruit as much, nor if it will be as hardy in my Northern California Bay Area climate. Guess there's only one way to find out! But the only place left will cost me $70 with shipping, so I am still hestitating!