On 2013-08-16 15:25:13 +0100, Phil Cook said:

On 16/08/2013 10:24, Sacha wrote:
On 2013-08-16 08:58:51 +0100, echinosum said:

Sacha;989975 Wrote:
Two of the nursery team saw a very large butterfly yesterday...

Actually that could be a garbled description of a monarch.

Interesting idea. I'll show them the photos and see what they think.
It's interesting that it feeds on Milkweed...

That's the food plant of the caterpillar. Adults would only be on that
to lay eggs.

Indeed but if there are some around, presumably it would attract them.
The site that echinosum linked to says that there have been some in
Cornwall and Scilly. And one escapee was seen laying its eggs on
milkweed in Kew. The eggs were rescued and hatched out a month later.
--

Sacha
www.hillhousenursery.com
South Devon
www.helpforheroes.org.uk