King Alfred used this word in his treatise on Pastoral Care in Old English about 1200 years ago!  His spelling is recorded as “ofergreow”.  I learn from the OED that the over-prefix can have spatial or temporal connotations.

• 07.130 was overgrown and disused at the eastern end

“over-, prefix.” OED Online. Oxford University Press, June 2015. Web. 14 July 2015.

“overgrow, v.” OED Online. Oxford University Press, June 2015. Web. 14 July 2015.