Yes, your 'Jams and Jellies Blackberry' vinca is Catharanthus roseus, commonly known as annual vinca. It's just a new color variety.

Why do you say it's late? I assume that you will be starting these inside.

I say it is late because annual vinca usually takes me about 13 weeks to get a decent size plug.

I was debating ordering seeds for the Jams-n-Jellies but decided against because I couldn't think of where I put them, I wasn't sure what to do with the unusual color.

I was at the nursery last week and saw them blooming next to pure white vinca --> W-O-W!!! They also looked great next to that flaming hot pink vinca with the white eye.

I bought a couple 4-packs of the J&J and white vinca to combine with, I have a pot this will look fantastic in.

So, yea -- unusual color but I ended up really liking it one I saw it. :0)

I started these from seed in early February under grow lights and constantly on a heat mat.
I've been very disappointed in the growth rate. It is now week 17 since sowing, and the plants are 2" tall maximum. Last weekend I decided to just put them in the garden and see. They were in 3" pots that are about 4" deep. The roots were extremely shallow.

I've never had such a poor result from anything that I've started from seed.

I ended up supplementing them with jams n jellies that I found at my local garden center. The pack had the bright magenta and white mixed in as well, so they look wonderful!
They are beautiful. However, I'll never grow them from seed again.

Yea, vinca can be a little touchy - I grow them every year from seed and some years they are fantastic and other years they don't do too well. I think maybe sometimes I provide just a bit too much moisture - but it can be hard to walk that fine line at times because don't ever want seedlings to dry out yet vinca is quite touchy about too much moisture. Oh well. At least we found them locally and can enjoy them that way :0)

Yea, vinca can be a little touchy - I grow them every year from seed and some years they are fantastic and other years they don't do too well. I think maybe sometimes I provide just a bit too much moisture - but it can be hard to walk that fine line at times because don't ever want seedlings to dry out yet vinca is quite touchy about too much moisture. Oh well. At least we found them locally and can enjoy them that way :0)

Uh, well....I'm going to have temper my rave. They are fantastic combined with white, but trying to place them in the garden is tricky. They don't show up well from a distance, and they don't look good in certain pots to my eye. Also not easy to combine with other plant colors in the vicinity. So...just not an easy color to work with in general IMO.