palm leaves turning silvery white?

Graham

New member
i have alot of young palms, yuccas and agaves in my greenhouse. the leaves on some of the palms (mainly trachycarpus fortunei) seem to have a silvery white colour to them. the leaves of my butia capitata have gone very thin and my washingtonias and chamaerops are going brown at the leaf tips. my agaves and yuccas have small brown crusty spots on them that can be rubbed off but seem to be badly affecting the plants. can anyone help please? my greenhouse gets good filtered sunlight but not really direct sun and is frost free.
 
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