Rosegreen seems to be a pretty modern invention. An older version of the name is Roesgreen. When considered in the light of other local placenames like Lowesgreen, Price’s Lot and Waller’s Lot it would seem that Roe was the beneficiary of a Cromwellian land settlement. I think Bawn79’s first instinct was correct and the site was used for sun worship. Interesting that the graveyard which is still in use occupies the site still and that an old church was built on it.
freepages.genealogy.rootsweb.com/~irish/Tipperary/places/rplaces.htm
ROESGREEN or LOWESGREEN
1837
a hamlet, in the parish of St. Patrick’s Rock, barony of Middlethird, county of Tipperary, and province of Munster, 3 miles S. from Cashel, on the road to Clonmel; containing 62 inhabitants. Fairs are held on Aug 2nd, and Oct. 23rd; and one of the R.C. chapels of the union or district of Cashel is situated here.