hi i'm no expert but i would suggest that the rhubarb is maybe too dry i do'nt think it should be flowering it usually means it is struggling put more water on and see.

Flowering is quite natural for rhubarb, both. It flowers in order to propagate itself and so this will take a lot of energy away from the leaves. Normal practice is to remove the flowers as soon as you see them so that they keep putting energy into the stems. I have already removed several flowers from ours this year

thankyou i cut it off i thought maybe it was because i forced it for too long .