[Goosegirl]

Does anyone know of a cause? I am growing my toms in a greenhouse and just harvested the first red one off Vanessa - bought from Robinson's Mammoth Onion place. Nice sweet taste - not too much of a tommy taste at the moment but rather tough skins.

[mumofstig]

Not so much a cause...but some varieties do have tougher skins than others. They have been bred that way for the supermarkets

In the blurb for vanessa they say vine ripening and good keeping quality, a good strong skin would help with that

[Goosegirl]

Ah - I wondered if it varied with the variety. Thanks for that.

[DavidT]

It could also be down to sporadic watering.