Thanks, Pete. I have tried pulling themn away - they seems OK and they don't seem discoloured but its odd becuause its 'brother' across the step...
Oh dear. Would that be through overwatering? It hasn't seen rainfall...
I 'think' its a Cordyline Australis we have (we actually have two either side of our front door) but the one pictured seems to have gone a bit...
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