I don't see why not, other than perhaps the heat of the Texas summer might do them in or at least stop them from growing. But if you take good care of them in terms of watering, they probably should do alright, perhaps they might not bloom in the worst of the heat, and then start when it begins to cool off and give a nice finish to the season.

i think you better bone up on 'sowing wildflower seed' theory ....

the idea.. is that they bloom in sequence..

AND THAT THEY ARE LEFT THERE TO RESEED FOR NEXT YEAR...

and then at the end of the season ... it is all mowed down.. to distribute the seed for next year ...

why are you ripping them out.. ????

those later ones.. may not have time to ripen.. before winter ... who knows..

ken

Winter? What is this thing your earthlings call winter?
I ripped them because they were ratty. As I said. The seedlings (which I did not sow, they were from the cosmos that had gone to seed) are already two inches tall.
Denninmi, I'm hoping that they produce another flush in a month but it may be too hot, we'll see.

What Ken is referring to is how a "true" wildflower garden is meant to work..meaning you sow it and let it work as it would in nature. Plants come up and flower and as those die back, others take their place while the ones that were dying back are self seeding for later. If you don't let the cycle complete itself, you'll likely have patches of nothing, or at best, might lose certain types that don't get a chance to reseed. Rather like deadheading might keep a specific plant from reseeding so it comes back next year, even if doing so makes it look prettier.

As far as the cosmos, I only seeded some this year for the first time so I don't know. I DO know that one place we visit that has them, no one pulls/cuts/deadheads and they continue to frost/