On 5 Mar, 10:51, Klara wrote:

They're supposed to be good against moles. I don't know whether this has
been proven, but ever since the spurge turned up in our garden the moles
have disappeared :-)

True. It's also called 'Mole Plant' or 'Mole weed' (euphorbia family).
In France we call it 'Herbe a taupe' (or Epurge). I suspect because
the sap is very toxic and an irritant, the moles keep away from them.
I've heard cows milk had turned toxic with it because they ate some.
Even snails became toxic. Don't mind not eating the later - the cow's
milk however is worrying.