On second reading, I am not sure whether the arrangement is by Silcher or by the editor. Silcher's name appears on the web page, but apparently in a different context. In fact I cannot find any website that clearly mentions any "Heidenröslein" arrangement by Silcher - are you sure it exists? Silcher is also notorious for (ab)using Schubert's "Lindenbaum" (lyrics by Müller), perhaps you are confusing these two?

Our experts may know more. (The native speakers Susanne, Wolfgang, Gerhard, Reinhard, Wilfried, etc. seem to have vanished, but I think some of our American friends can help.)