Mad Cow wrote:

........He was interested in the way worms bury stones and ancient remains by
burrowing under them and casting the soil onto the surface beside them.
He found that a fallen stone at Stonehenge had sunk ten inches, and
another 9 1/2 inches (measured before mass tourism wore the ground away)
so worms won't have added much to the depth of the standing stones'
bases.
Hops need a deep moist soil, so your garden is likely to have more worms
burying things faster, but it seems an inch in five years is good going.
Do you know how old your rockery is?

--
Sue ]
--
I really appreciated the above info. I am just yanking out the hops shoots
as they appear and transplanting them around an old dead tree; mostly in
sunflower seed shells from the bird feeders above. Of course, there's also
been added a lot of topsoil to the rock garden over the years and that's how
the stones in my rock garden are now so deep. p.s. Darwin was my bible in
my teens )..... Pinetree