Does NOT take much...

... to start an invasion.
They snuck in on an influx of top soil some years ago. I found out, today, that:-
"The bulbils are formed at the leaf axils and also at the roots."
I didn't know the also formed above ground must check and watch for them.
But it's fairly obvious the degree of invasion - extra, at the foot of the Rasps.NOT to be confused with Greater Celandine, which does not even seem to be related by Linnaeus's nomenclature.

Mam introduced us to the  Greater one as a cure for warts, by rubbing the orange sap onto the offending lump.

Being me - I just HAD to look it up:-
"People use greater celandine for conditions such as cancer problems with the digestive tract, liver and gallbladder disorders, and many other conditions, but there is no good scientific evidence to support these uses. Using greater celandine can also be unsafe.

How does it work?
The chemicals in greater celandine might slow the growth of cancer cells, but might also be harmful to normal cells. Preliminary research suggests greater celandine might increase the flow of bile. Greater celandine might also contain chemicals that reduce swelling and relieve pain. Some chemicals might kill bacteria, fungi, and viruses."


and, further down, that:-
"Side Effects & Safety.

Greater celandine is POSSIBLY UNSAFE when taken by mouth. It can cause serious liver problems. When applied to the skin, greater celandine can cause allergic skin rash.

(So much for the warts?)
Not enough is known about the safety of giving greater celandine products intravenously."