Same as last!!!!!

[JohnnyD]

Same neighbour! Same question. What's this John?
Help!
Looks rather annual and is full of dark coloured seeds.
JohnnyD

[Gail]

Datura seed pod I think.


And this was what the flower looks like (when I grew it in Suffolk).

[JohnnyD]

The plant was a single stem growing in a pot of bulbs - about 12" tall.
Datura seems a little unlikely Gail.
JohnnyD

[JohnnyD]

It seems you may be right Gail.
Further research reveals Datura stramonium as the most likely culprit.
It will be interesting to see how the seeds perform.
Thanks Gail.
JohnnyD

[François Lambert]

It can be quite invasive on bare soil ... but apparently the seedlings have trouble to cope with competition from other plants for (I presume) light.  I had dozens of these growing on bare soil and they did make loads of seeds, but the next year, when grass had covered the area none were growing.

[ian mcdonald]

Very poisonous.