Posted: 28/08/2015 at 14:26
His Chris if you go right back to my original post you'll see I had the same proble. I followed the good advice and as my plant matured it grew side branches from the top. Last year I took one offshoot as a cutting and it's now a single header a foot high. This year I took two offshoot cuttings in the spring and they are doing fine.
I do find the mature plants like to be kept well watered. Good luck and be patient.