Janet Tweedy wrote:
Quite agree. My arum lily has also got black marked leaves and is
nothing out of the ordinary.

I've found the one we have, Arum italicum 'Pictum' - lighter
green/yellowish veins. I've come accross the Titan which is growing at
the Eden Garden. My gawd, have you seen it?!? It's 7ft high!! A
woodland garden for dinosaurs )