Denshi Jisho — Online Japanese dictionary

Couldn't find anything for 生い茂る~, so trying 生い茂る instead.

生い茂る おいしげる to grow thickly; to be overgrown; to thrive; to grow in abundance
Godan verb with ru ending, Intransitive verb 

You can also

Look up kanji details for 生い茂る.

Try a Yahoo Jisho search for 生い茂る .
Try a Goo Jisho search for 生い茂る .
Try a Google search for 生い茂る .