Cutting to 3" or less or more should not really make a difference as they send up new canes from the main root. It is not really the old cane that grows anew.
If the leaves are/were still on and green then they would be producing some food for the plant, so really it makes sense that if green then leave them to get on with it. Cut back when the leaves turn and drop off.
Last couple of years have been odd so not overly surprised if your cropping has been poor. Mine have not really made a raspberry for sometime. May need to show them a book on what it is they are supposed to do.
They are shallow rooted so will suffer if dry, mulch is used for this, they are derived from a woodland plant and wood lands do not dry out as a garden does. Not sure about manure, may find it is of some benefit, but not sure by how much. Would have thought a chipped bark+compost+manure mix to be better.
If the leaves are/were still on and green then they would be producing some food for the plant, so really it makes sense that if green then leave them to get on with it. Cut back when the leaves turn and drop off.
Last couple of years have been odd so not overly surprised if your cropping has been poor. Mine have not really made a raspberry for sometime. May need to show them a book on what it is they are supposed to do.
They are shallow rooted so will suffer if dry, mulch is used for this, they are derived from a woodland plant and wood lands do not dry out as a garden does. Not sure about manure, may find it is of some benefit, but not sure by how much. Would have thought a chipped bark+compost+manure mix to be better.
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