mistery prickly plant

[reifuan]

any ideas as to what this might be?

[Carolyn]

The leaves look as if they might be a solanum of some kind, perhaps. The only solanum which I can think of which has prickles is the aubergine, which can be quite painful to harvest. The leaves are not aubergine though...
This might give you a starting point in your search!

[Matt T]

The leaves remind me of Leonurus cardiaca (Motherwort or Heartwort), which is a labiate. It is also spiny on the inflorescence, but not as prickly as the plant you show. Could be another avenue to try.

[Jupiter]

It looks very much like some of the Aust. native solanum. Have you been buying "bush tomatoes", Australian bush tucker product, and spreading them around your garden?

Jamus

[reifuan]

Found it! It's Xanthium spinosum, apparently.

[Maggi Young]

Regarded widely as a noxious weed, with seedlings being especially toxic to livestock -  according to the 'net.