Like most of Europe, Slovakia has a strong woodland tradition, and even today much of the land in Slovakia is covered by trees.
There are a wide variety trees (stromy) here and a rich phraseology to go with them. Without further ado, let us get to the root of the matter (prísť veci na koreň).
On the subject of roots (korene), if you want to put your roots down (zapustiť korene) then it is probably a good idea to show that máte tuhý koreň (you have solid roots), i.e. that you are healthy in the true Slovak sense - a good drinking partner. However, being called a starý koreň is far from a compliment, as it means worn out.