Ah, well, the old eyes aren't going yet, I guess, but last night I was sure straining to see the carnations!
Moss Roses will reseed with abandon...can I give you some ideas & information? Right now, the color placement is so pretty -- you can actually see the big mounds of color of each individual plant. Next year, you'll have more plants, but they won't be as big, so instead of being a 12" mound of yellow next to a 12" mound of coral, they will likely be 8" mounds...so more polka dotted in a way.
You can save the seed -- and Portulaca has got very interesting seed pods. Look right next to an open flower and you might see a pointy thing that could either be a 2nd bud, or a seed pod from the 1st flower on that little stem. The seed pods usually have dead petals on them. Wipe away the brown stuff (which is dead petals) and you'll see a little shiny round knob with a little x-shaped indentation, and that's the seed pod. If it's green or red with a little bit of a point, it's a pod that will bloom. With your thumb, try to dislodge the rounded knob. What could happen is that you will find the knob is HINGED. It literally hinges open like a Faberge egg and seeds are both in the lid and the egg. The ripe seeds are dark brown or black and very small. If you dislodge one that has lighter seeds, just dry it and it will ripen on a paper plate or a cereal bowl. You might also dislodge the whole thing and get the seeds out that way, but the hinge is cool. I think the Latin name, Portulaca, has something to do with that hinge, which I believe is faily rare in the world of seed capsules.
Some cool things to do with moss roses: If you want to get creative, a the end of the year, when the moss roses get ratty looking or a frost comes, you can pull the plants or cut them off BY COLOR. For example, pull all the pale pink ones and lay them on top of the ground around some pale pink Heritage (or other) pink roses for about 2 weeks. Likewise, pull the red ones and put them somewhere you'd like red flowers next year, the orange ones might look good with Sunset snapdragons...you get the idea. It doesn't look too great to have the moss roses laying on the ground for two weeks, but the leaves are falling from the trees and there is a lot of debris on the ground anyway, so maybe you can get away with it. In any case, Moss Roses (and Impatiens if you're interested) will go ahead and ripen their seed, even if the plant is out of the ground. You will literally get 1000s of seeds that you wouldn't have if you threw them in the trash or compost as soon as you pulled them. I see a little room to the left and a lot of room to the right where you could lay the plants, but maybe you'd like to get some carnations for there.
As far along as your flowers are right now, there is plenty of seed in that bed already for them to come back next spring, and you could certainly harvest more for yourself or trade.
Right now I am trying to figure out how to corral the seeds to trade. Pulling plants and putting them in paper bags is only working so-so. The seeds are little and are getting caught in the folds and cracks at the bottom of the bags. I have enough of the moss roses growing here, I could probably use a pillow case, but I imagine all of the seeds getting caught in the seams....or worse, th plants rotting! Right now I am trying to find bags without the square bottom -- bags like you'd get if you bought a pair of gloves from a dept store. I think there are fewer seams in them.
I have rambled on long enough -- try to find the hinge and if you have kids, show it to them, too!
Oh, one more thing -- if there is a color you don't like, a color that doesn't go with the rest, or a color you think there is too much of, you can pull that color and throw it away leaving a better mix to reseed.