Mr Dragon
I am across this i think.. in 28mm anyway
Ok yeah Grand Manner good news and bad news ...
I have lots of GM stuff it is
Superb ..
, but hyper expensive ..
,+ heavy resin .. hence postage is hurtfull unless in Uk .. they do have some Trojan walls not on the catalogue anymore that can possibly be ordered ...massage your wallet first ..
GM do a "Sacred olive Grove "which is a very nice model as well.
I think Bauda do a very nice Priest set , as do First Corps.. have a look.
Also Terrain at Model Earth do some
Minoan Temple/ ruins , they are awesome ( just google it ), I have one that painted up very well indeed , and it was not that expensive.
Trees; K&M Poplars are very well suited to this period , but hard to find .. and a bit expensive. try ebay
Olive trees; sorry very few options .. I used Noch , but they are expensive and not quite right .. I converted some .
Vineyards: not many commercial options there either .. maybe make your own .? or get some railway ones .
Hope this helps.