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G'day again Han,
I hear on the radio that Sydney is getting this
rain, so are we up on the mid-north coast, (-:}

You wrote: ... I didn't harden off the plants before planting them,
how do you normally do this?...

You had every right to have presumed they had been
'hardened off' when you bought them!
Unfortunately, rights and expectations often diverge.

You wrote: ...... I have fed them some fertiliser just recently....

So, what sort ,and how?

You wrote: Could it also be too much sunlight?

Yes, could be,..... to much Sun?,....to little
Water?,....to Much tucker?,.