Yes remove the dead flower heads but allow the foliage to die back naturally as this will help to feed the bulbs so that it flowers again next year.

Thanks Moongrower :o)

You're welcome Pip

It does sound odd to us in the UK talking about Daffs in August, Pip!!! lol.

Unless you have very rich soil, Pip, I would also feed them lightly with a high potash food, such as tomato food, once or twice while the leaves are dying back. That will plump the bulbs up nicely.

LOL Spritz :o)))
Thanks Tugbrethil!