Rhubarb dieing down

I have 2 rhubarb plants one has died down full over past few weeks the other beside it hasn't, is this normal our is it dead ?

 

Probably normal I'd say.

 

• Yes, it dies back then regrows when spring arrives. You can encourage it by giving the crown a good dollop of well-rotted manure or some garden compost enriched with pelleted manure but do this on or after a rainy day and not when there has just been a frost. other causes it dies .Overwatering.Poor soil aeration .Too much heat. Iron deficiency.Pests and diseases

I havent personally grown it but my nieghbour used to quite alot