does the cactus flower does the same thing as the bright bell and the frost snap? if so, i only need to plant cactus?
All types flowers work the same, so you should only need to plant cactus. The only real reason for different flowers is for the window boxes
And trading for new seeds or items.
^ All brightbells, frostsnaps, and cactus flowers supply herbalists the exact same way. There’s no real reason to have farms for different types unless a trader wants them or you want to spruce up your town with flowers.