What legends are there that say specific plants, herbs etc. protect people from vampires?Anything you know will be deeply appreciated, even if it's...

The first and most obvious answer is the history of garlic
as a means of repelling vampires. This legend traces its history to ancient Romania. The
Romanians believed that garlic possessed the ability to ward off evil spirits of all
kinds. As such, its use against vampires, seen as representative of evil, was a natural
choice. For more on that specific lore, see
http://www.garlic-cloves.com/garlic_and_vampires.html

Other
herbal remedies included Hawthorne and Rowan (Ash) and several other woods for use in
the stake that is driven through the vampire's heart:

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In many of these legends, the stake must be of
a
particular wood, such as ash, hawthorne, maple, blackthorn, buckthorn,

or aspen. The power of these woods is often claimed to lie in
Christian
symbolism. For example, ash has been cited as the wood from
which
Christ's cross was made. Plants with thorns, such as hawthorn, wild

roses, and blackthorn, are associated with the crown of thorns worn by

Christ at his crucifixion (Kuehl,
nd).

As less
successful but nonetheless used in literature method is the scattering of seeds in the
path of the vampire under the theory that he or she will become so caught up in counting
the seeds that he or she will forget about coming after the victim. This method has not
been put to all that much use, however, and it has not been effective in much vampire
literature and lore.

Although not an "herb" or plant, holy
water is another method of choice against the undead. Again, this relates to the fact
that they are evil and something good, like holy water, is toxic to
them.