raised beds to deal w/pH?
I just moved from Pittsburgh (native soil pH 5.0) to Columbus, OH (native soil pH 7.0).
I grew azaleas in-ground in the 'Burgh beautifully, with only late frost issues to worry about. I even lucked out and never had winterkill despite our marginal zone.
Here, however, I think my pH is WAY too high for good azalea and rhodie growth, am I right?
So, I am looking to do some terraced raised beds along the exitway from our sunken patio, and some other areas of the yard.
If I do this, couple questions:
1. Will being raised up expose the roots to enough winter cold to make winter hardiness a bigger issue than it already would be? Or can a large enough bed alleviate this problem?
2. Am I better buying "topsoil" and acidifying it, an "acid potting mix" type thing, or making my own planting mix? If I make my own, what should I use to make it?