Why have the bottom leaves of my mature cordyline turned brown?

The tips went brown first and gradually spread to the whole leaf. The tips on every leaf also look damaged. Is the cordyline diseased or is it just because the lower leaves don`t have enough light?

Answers:
Don't worry - it is normal for the bottom leaves to go brown.

Gently take off the brown leaves and you'll see a wonderful trunk appearing.

You only need to worry if no new leaves appear at the top.

Other answers:
Underwaterd them and too much heat
Underwaterd them and too much heat
wind burn possibly
theres been a naughty animal around that there plant...
highwinds will burn the leaves the plant grows for thirty years + you can pull off damaged brown leaves .
goodluck
various under watering, wind burn. natural growth , dog

I would say as u have the tips damaged as well that it's wind/or frost although this is a hardy plant you can still get sone damage
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