My googling finds the phrase
Tandem Fit Arbor Surculus as the motto of a school in South Africa, which they have translated as
The Twig Will Eventually Become A Tree.
Tandem fit Surculus arbor apparently literally translates to
a shoot at length becomes a tree.
http://www.eudict.com/?lang=lateng&w...rculus%20arbor
I could find nothing for
Soevus ... but plenty of references to
Saevis tranquillus in undis (
calm in stormy waters).
http://books.google.com/books?id=uqS...0undis&f=false