In message , David WE Roberts
writes
In my back garden the 'soldiers' grown from last year's fallen tomatoes
are starting to ripen fruit.

From this I presume that they in turn could drop fruit to provide seed
for next year.

So what is there to stop tomatoes becoming naturalised in the UK?
I assume that the current climate is conducive to outdoor tomatoes and
the last winter was certainly pretty harsh.

I found a volunteer tomato plant (only about 9 inches high) growing in a
pavement a few weeks back.

Actual naturalisation, rather than local persistence, or the occurrence
of causal plants, would require something to disperse the seeds.

(There's also a 10 or 20 yard colony of a late growing potato in a
roadside verge a few miles away; I'm fairly baffled as to how it got
there.)

Although I haven't seen tomatoes growing as weeds in mediteranean areas.

Cheers

Dave R


--
Stewart Robert Hinsley