I assume your strap leaf paph is a multi flowering type? I don't grow them but they can take forever I read. also, difficult to grow in general, although I don't know what makes them so difficult.
I'm just not that drawn to them for some reason including their big plant size.
Delenatii need a lot of water while in growth mode and slightly drier in the winter. I don't think they need too much light as Armeniacum does.
but then again, I read delenatii can be difficult.
I have an Armeni White, which is the cross of the two. the leaves are rather large but look just like its parents. and even better, grows nicely and blooms freely with usual care routine with maudiae or phals.
I grow hybrids only and relatively "easy" ones as I find joy in watching plants grow and flower. otherwise, I get frustrated and that takes away the whole fun for me.
I'm sorry I can't be much of help, but hope your plants will bloom when they should.
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