"Sacha" wrote ..
This really is extraordinary. In the biggest greenhouse this morning, a
customer suddenly said "WHAT'S THAT????" and there, buzzing about a stand
of
primulas, was a hummingbird hawk moth! Normally, we see these in the
garden
in hot summers in August and September, often on Salvia involucrata. But
in
March......?!

Take a look at...
http://en.wikipedia.org/wiki/Hummingbird_hawk_moth
and
http://en.wikipedia.org/wiki/Galium

Have you got one of these species growing in the greenhouse/garden or
perhaps nearby?
If not you may get them to breed if you plant some in a clump somewhere.

--
Regards
Bob H
17mls W. of London.UK