Anyway, they grew very tall, and a few had only 1 layer of flower petals, but most were clearly doubles with many levels of petals. I didn't bother saving seeds from the zinnias with only single layers of petals, only the thick doubles.

Earlier during the season, just to experiment, I pulled a few seeds off of fully opened flowers and planted them in a small open spot near the others, and they came up and just started to open their first flowers when the first frost hit about 10 days ago. So I know they will germinate and grow, but I am wondering if these seeds will produce double flowers of similar colors like their parent zinnia plants?

Also, why do some zinnias from the Burpee Giant flowered seed packs only produce single layer flowers, while most others from that pack produce thick doubles?

I want to grow seeds from last year's flowers so I can hopefully ensure I end up with a good assortment of colors, instead of a bunch of plants that only produce a few colors because simple dumb luck resulted in growing 12 seeds that didn't include all of the 6-7 colors in the seed pack. Then the next year I grow 10-12 more seeds from that same pack, and end up with 3 different colors than last year! I just can't seem to beat Murphy's law and have all of the colors from that pack represented in the same season!

" I didn't bother saving seeds from the zinnias with only single layers of petals, only the thick doubles."

We think alike on that. I don't like the single zinnias, either. In fact, since I breed zinnias as a hobby, I usually pull up single zinnias, because I don't want bees crossing them with my better zinnias. If a cull is growing too close to a zinnia that I like, I use a hand pruner to cut the cull off at ground level, so as not to disturb the nearby zinnia.

"I want to grow seeds from last year's flowers so I can hopefully ensure I end up with a good assortment of colors..."

I mentioned culling. One thing you can do is to plant your zinnias closer together than you normally would, and then at first bloom, remove (cull) those that aren't to your liking. Zinnias are somewhat of a numbers game, and the more of them you grow, the better are your chances of finding ones that you like.

"I just can't seem to beat Murphy's law and have all of the colors from that pack represented in the same season!"

One sure way to have all of the colors from that pack represented in the same season is to plant all of the seeds in the pack. If you don't have room to do that, and I assume you don't or you would have, my tip about planting them thick and thinning them out at first bloom could help you get better color diversity.

"...instead of a bunch of plants that only produce a few colors because simple dumb luck resulted in growing 12 seeds that didn't include all of the 6-7 colors in the seed pack."

That "6-7 colors" thing caught my eye. Zinnias come in well over a hundred different colors. There are more than 7 different pinks. Most packets of "mixed colors" are not formula mixed from fields of separate colors, but are grown in a field of mixed colors. Zinnias are pollinated by bees, which accidentally cross pollinate a significant percentage of the blooms they visit. So a lot of color mixing goes on. And even though your zinnia seed packet doesn't say anything about F1 hybrid seeds, chances are that some of them actually are F1 hybrids, courtesy of the busy bees. But bees keep poor records, so you don't know what got crossed with what. And then, when you save seeds from one of your zinnias, you actually may be saving seeds from an unlabeled F1 hybrid, so that you will get significant variation in those F2 generation hybrids that you grow next year.

Adding to the variety of colors that zinnias can have, zinnias, like dahlias, can combine two or more colors in a bloom. So the number of different color combinations can be huge.

You can even get green and white.

Some zinnias can look somewhat like dahlias.

By saving your own seeds, you can develop zinnia strains that you like, and the more zinnias you can grow, the more you will have to pick from. I grow zinnias as a hobby, and my breeding efforts look for new zinnia flower forms and plant habits. Zinnias tend to be full of surprises, so predicting the results from just a few seeds can be, as you say, subject to Murphy's Law.

ZM

of all he said.. he hit the couple things i was thinking ...

but all i want to add ... is to ask ... where you came up with the number of colors ... was it perhaps.. the pic on the package????

if a mix is a representation of seed in a given field.. as zen notes ...

then one would have to presume... the picture on the pack.. or on the web ... is a representation of the mix ...

not a written in stone guarantee of what is in the mix ...

i also note ... you only sowed 10 or 12 seeds ... your odds of getting what you wanted.. were so low.. to begin with ... which leads me to suggest sowing hundreds... and culling out.. what you dont want ....

if you are only going to do a few... then buy packs of single color seed .. say 2 or 4 ... and do two or 3 of each ... and make you own mix.. but then at least you will end up.. most likely ... with what you thought you would get ....

i wish you luck

ken