No, that's not true. The older canes will eventually lose its leaves - though it may take a few years before they drop - and you will end up with leafless canes.
The difference between deciduous and evergreen dens are that the deciduous ones, for example, will put out new growth with leaves and then towards the end of the new growth's maturity (usually towards the end of its resting period), it will drop all of its leaves. Think of it as a tree. It leafs out during the spring, grows during the summer, then drops all its leaves in the winter.
Evergreen dens do not do this. They hold onto their leaves throughout the year, but, again, older canes will drop leaves. It's a slow and gradual process.
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