J Fortuna wrote:

More specifically, would it be legal to carry-on a Phal hybrid in bloom or
in spike on an airplane flight between Poland (which is now in the EU) and
France? Could someone doing that get into trouble? Would paperwork be
necessary or advisable?

Technically, there should be no problem and no paperwork required.
I don't know anyone who's done it though . I'd take a receipt for
the plant with me just in case.

I've had plants *sent* to me (in Germany) from the UK, no problems.

Which agency could one contact to find out for sure
about customs regulations (if any) pertaining to transport of orchids within
the EU?

Customs, Polish & French.

Seperate but related question: Would it be a bad idea for other reasons to
carry-on a plant in bloom or in spike on an airplane? (other than the risk
of snapping a spike during such travel)

I can't think of any.

Nina
--
C'est les microbes qui auront le dernier mot.
Louis Pasteur
http://www.chaotropic.net