I stay in ooty.. i see april - may is recommended more tk visit here..but trust me it is not good time to come. april and may are the hottest month of the year.
the flower show and fruit show is now more commercialised and lost its value. hotels,markets, public places are crowded. huge traffic jams. what i recommend is - " monsoon season" since landslide is not a prob here, and oct to feb is best to come here