Dong wrote in message ...
On 11 Jun 2004 06:30:29 -0700, simy1 wrote:

in my experience the pavers heave a lot more than cinder blocks.
Cinder blocks, buried 3 inches at the bottom, are the best choice in
cold areas. In all cases (blocks or pavers) the soil around them will
be limed for at least one foot.

Hm, I did not know that when I built my flower bed. I have not seen
sign about the PH changes yet. Do I need to add something acidic? Soil
here (Urbana, IL) is acidic to start with I believe.

Dong

I bet you need to do nothing. I figured it out myself when pH tests
near the driveway came out about 1 to 2 units above those away from
the driveway. Now that driveway has been there a long time, in MI it
rains more than in IL, and certainly the concrete is more degraded
than in a brand new paver (increasing the surface area). It is also
possible that the base of the driveway has been filled with slag
(broken concrete), which is cheaper than gravel.