I planted a Frederick last Spring on the East side of a Gazebo. It went from a 5 gallon plant to a good sized vine that covers a 5' X 10' area. The thing is solid vine. I have only had 1 flower and fruit (which a bird got). This past summer it was watered every other day. This summer I am hoping to lengthen that interval out a bit.
Right now I have C7 Christmas lights around the bottom area and a cloth covering standing by to cover the base in case of a hard frost. During this last frost, the only damage that it got was to a few top leaves.

I love passion flowers too, though I only have one half-performing 'Incense' that I purchased years ago (I hadn't been good about dealing with the caterpillars so it's my fault, not the plants). I have a very sturdy iron arbor that I'm thinking of switching over to passion flowers. I do love their foliage and blooms, and I don't mind a FEW of the caterpillars now and then.

I've heard so many times that they are hard to start from seed and that they have a very random germination rate. It sounds like you've got a way to overcome it? I've read and heard to soak the seeds in something acidic like lemon juice overnight. Any tips for seed starting?

Great plants though. I really should be growing more of them, so thanks for highlighting them.

Take care,
Grant

Is the Incense getting enough sunlight in summer? If catepillars are desimating your plants, you may have to pick them off everyday until plant can rebound. I love butterflies but they can do a number on your vine. You are right germination of seeds is very sparse and random. but the seeds online are very cheap. You only need a few of each variety to germinate. I have a very simple cheap set up in my tool shed. I have cheap flourescent 48" lights, heat pads hooked up to a heat thermometer, and those cheap plastic covered seedling trays. The trick is once the seedlings get a second set of leaves take them out of trays then acclimate them in bright window or AZ room, for a couple a weeks then outside with only morning sun in Spring. I've learned the hardway leaving seedlings in seedling trays to long and they grow week stems fall over and die.
A. Mom keep us posted on your P. Frederick. I know they are a little more cold sensitive then some hardy P. vines. Lol, bird got your sole fruit. Iam sure you will get a lot more fruit next season when your plant is more established. It may die back all the way to ground in Winter but will hopefully come back in Spring like most Passi's.