I have a large cordyline in the back garden which is fine. The 2 in the front are the variegated variety and I believe they are more 'fragile' but I still don't know what 'disease' they've got-I say disease because the colour of the browning is entirely different than brown tipped and dying leaves of the past.
Seems to me they've caught cold if they've been exposed to cold winds from Arctic regions. Many of these are tender and others only hardy to -5c at the most and we've had worse than that even down here this winter.
All you can do is wait and see if they recover as the weather warms up and, maybe, come mid April, give it a liquid feed of seaweed to encourage it. Don't be tempted to strip off dead leaves yet as they'll provide a bit of protection form late frosts.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Mine looks exactly the same - never happened before -, and I can only assume it's been caused by the late snow and frost we have had. Hoping it will recover. Good luck!
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All you can do is wait and see if they recover as the weather warms up and, maybe, come mid April, give it a liquid feed of seaweed to encourage it. Don't be tempted to strip off dead leaves yet as they'll provide a bit of protection form late frosts.