Dear Sri Ravi,
Hosur is one of the best place for rose farming and also the best place to get good marketing access to both Bengaluru and Chennai. Mostly Rose farming, It is advisable for those farmers, who can spend their full time in the land.
Here, in Rose farming ,If you can spend your full time in the land, go for cultivation of Spray Roses and/or Dutch Hybrid Tee Roses. In spray Roses, one of the best old variety is MIRABEL, which gives good considerable yield, with lesser prices. In New Varieties , ZADIQUE is good and it gives good and considerable yields, with good market price. In Dutch Hybrid Tee roses, go as per market study.
If you can not spend your time or if a proper care taker is not available, the Rose farming may not be good. This is my opinion as a farmer. Think twice, before entering in Rose farming.
with best wishes, g.p.rao, farmer