If youre looking for lower range stuff there is certainly a lot to go around! i have posted many many songs with flower in this forum category i reccomend sifting through if you want to hear more. tho if its actuall GEN factor youre thinking of then yeah a lot us it too but its not rly a pitch thing in that case!
still in terms of obvious lower range flower artists, id suggest
れすた (Lesta),
imi,
teary planet,
Misumi - to name a few if you havent seen em already!