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Sauropod fodder

In an American Journal of Botany article  by Spatz, Kohler and Speck, ( to
be found at: http://www.botany.org/bsa/ajb/1998/85-0305.html )

"The hollow stem of Equisetum giganteum owes its mechanical stability to an
outer ring of strengthening tissue, which provides stiffness and strength in
the longitudinal direction, but also to an inner lining of turgid
parenchyma, which lends resistance to local buckling. With a height >2.5 m
isolated stems are mechanically unstable. However, in dense stands
individual stems support each other by interlacing with their side branches,
the typical growth habit of semi-self-supporters. "

At 2.5 meters, (and being the species "giganteum"), this plant dosen`t seem
tall enough to warrant long Sauropod necks. Unless....the strategy was to
feed as far into a grove of these plants without getting hung up in their
lower structure, only cropping the uppermost (more tender?) parts . Were
horstails any bigger in the Jurassic??

As far as feeding off pines is concerned, how fast could the pines then
regenerate? Couldn`t horsetails regenerate a lot quicker?Also, aren`t pines
generally adapted to a dry habitat? How far then, would the Sauropods have
to go to fetch water, and would this be feasable to their bioenergetic
budget??Wouldn`t horsetails provide a great deal of the Sauropod`s needed
water supply?