Help! Waldo Blackberry new cane is very long.

in Fruit & veg
My Waldo Blackberry Bush, planted this year has lots of ripening fruit. A new thick cane has emerged and is now almost 6 feet long. Should I shorten it or let it grow as long as it wants? It is growing against South facing wall in a large pot.
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You need to cut out all the fruiting wood right down to the ground after harvesting and tie in the new shoots.
Mine sends out 4-5 new shoots each year, and as you say they are very long - at least 8ft or more.
When I bought it the blurb said they get only to about 6ft.
But, I find they're quite easy to control by gently encouraging them in the right direction then looping the stems back on themselves on the wire above.
The stems growing this year are those 3 on the lower left of the plant (there are also 2 shoots on the other side not quite as long)
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Once this year's berries are picked (which will be around the end of July) I cut out the old canes that have fruited and tie the new canes in place. The new canes are still bendy enough to train them.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.