Growing in the garden or in a container?
They are growing in the garden, perhaps I should mention we are only 100yds from the sea, although they have some relative prorection,
Where they both bought at the same time are identical?
Meant to say "and are identical?"
yes i they were bought at the same time, and were identical when bought
Right- my feeling is one has not ventured into the surrounding ground whereas the other has and the poorly one is suffering from lack of nutrients etc.
My suggestion would be to carefully dig it up -if you find the roots are still confined to the original root-ball tease them out, enrich the soil, replant perhaps in another spot and keep well-watered
Let us know know you get on
thats great, I will give it a go, and will let you know if I notice any significant changes to the plant, thanks for your help, much appreciated