Have followed this article with interest, so here's my
thoughts.

I do not support the NT, do do visit some of their properties,
so am neutral on that.

It seems to me if the NT think it is worth spending money on
building old fashioned style greenhouses, then they MUST grow
only the crops and varieties that were available in the period
they are mimicking.

Good luck to them, presumably they will do some monitoring of
visits etc at one rebuild before spreading it across the
country?

--
Roger T

700 ft up in Mid-Wales