Stumbled across this interesting site last night,the author is trialling lots of figs in ground in Germany.

The site is in German...
http://feigen.bueschken.com/index.php/projekt-

But thanks to google translate tool is more accessible here:

https://translate.googleusercontent.com/translate_c?depth=1&hl=en&nv=1&rurl=translate.google.com&sl=auto&sp=nmt4&tl=en&u=http://feigen.bueschken.com/index.php/projekt-feigenwiese&usg=ALkJrhhKegIlejA93O_JWsSww80Ata6dzA

Enjoy!