Curling oleander leaves

Another novice query: I've noticed a lot of the leaves on my newly
planted oleanders are curling up - lengthwise this is, along the main
axis of the leaf. What is causing it? Heat? Lack of water? Too much
water? They are in large metal containers in full sun. Mulched with
newspaper and wood chippings.

Thanks for your patience.

Damian Martin
Talavera, Central Spain
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