Niagara Grapes turning purple?

[Greenthumb18]

I have niagara grapes in the garden that are a little bigger than pea sized and are turning purple for some reason, when their suppose to be white grapes. Would anyone know what the problem may be?

Thanks!

 

[vfem]

Are they rotting perhaps? I see some 'purple' color grapes on green grape vines, but it turns out they were not ripening and just rotting because of insect damage and weathering? Or are ALL the grapes turning?

 

[Greenthumb18]

Are they rotting perhaps? I see some 'purple' color grapes on green grape vines, but it turns out they were not ripening and just rotting because of insect damage and weathering? Or are ALL the grapes turning?

Hey vfem
Thanks for replying!

No i dont think they are rotting i actually took one off to see it looked perfectly fine no rotting. No, not all the grapes are turning purple just a few in the bunch. Or maybe i don't have a niagara, which i hope is not the case.

 

[vfem]

I would like to see pictures actually... that may help!