rhubarb photos, whats up with it?

[jesssands]

see the sticks on the left look quite nice, so whats wrong with the sticks on the right?? 

[jesssands]

[Fork]

They are past it.

Rhubarb picking time is about over now.You should leave some leaves on to strengthen the plant for next season.

[jesssands]

Thanks Fork, I wondered if that was the case.
I have left about half the stems still there, so now I will leave those to die back. Next year I must pick sooner rather than later. When would be the latest sort of time to pick it?

[Fork]

Generally you should not pick your rhubarb after the end of July but I always stop at the end of June......and even then some of mine looked like yours,the ones on the right that is.