Raised beds

I know this topic has been discussed recently, but I am having a hard time
trying to find it in the archives.  I have a space just outside my back
fence that I want to make a raised bed for my red hot pokers because the
space gets more sun than the place my pokers are currently planted.  What
would be a good thing to use for the borders?  I think I remember someone
saying that concrete blocks are not good to use because they leach into the
soil(?)  The space is about 2x5.  And then, what type of soil do I need to
add?  Compost?  Top soil?  Any and all replys are appreciated!

Pottsey
zone5
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