Well, I looked at herb prices out of curiosity from the bxpw, and I realized some the the seed/herb prices might be better. Plus, the ranarrs im growing now arent the best xp in the world.

 

Also, are there any other plants in the allotment patches worth growing? any flowers?

Grimy's farming spreadsheet will definitely be of interest to you. If you have a Google account you can log in and go to File > Make a copy... so that you can edit things like Scroll of Life and Juju potions True/False. RuneScape wiki also has an Herb farming profit page.

 

So the best herb to farm really depends on your particular set up. As far as allotment goes, the best money you'd get is tomatoes, which aren't worth your time. For flowers, the only profits are marigolds and limpwurt, but you'd have to make the determination if they're worth it for you. Limpwurt roots are currently 2,383 coins and Marigolds are 3,882 coins.

I don't know if they're "worth it" from an efficiency point of view, but marigolds (flower patch) sell for ~3.5k and the seed is essentially nothing.