Does anyone know what plant this is.

[WVNed]

It grew in the boxes I made for my deck. I do not think it is native here and came in one of the packages of seeds I planted.

 

[Dave Cureton]

Hibiscus trionum, commonly called flower-of-an-hour, bladder hibiscus, bladder ketmia, bladder weed, modesty, puarangi, shoofly, and venice mallow, is an annual plant native to the Old World tropics and subtropics. It has spread throughout southern Europe both as a weed and cultivated as a garden plant.

 

[Dave Cureton]

That's what I get from the picture this app.

 

[Johniejumbo]

My seek app says hibiscus trionum.

 

[WVNed]

Thank You.

Mine does this. Each flower blooms during a single day that is sunny, and remains open for only a few hours.
Which made it kind of interesting to watch.