Following varieties are easily available in Karachi and all are heavenly fragrant (some intensely and some to a lesser extent)
Gardenia vietnamensis
Gardenia jasminoides
Gardenia carinata
Gardenia thunbergia
many of them are planted in a local mix of manure and soil, so are established plants with acceptable number of blooms.
Yesterday I sniffed a Gardenia jasminoides which was in a 2' tall and 18" wide clay pot and was a well established shrub with lots of blooms and buds.... the fragrance was just unbelievable!!!!!
Price was Rs.3000/-
I have been reading much stuff on Gardenias and was thinking on starting them from seeds, available at Thompson and Morgan, any views?