Torstol seeds used to be 200k+, used to be pretty hype when you got one from slayer
farming would be so great if bossing and slayer didn't ruin everything else.
Dwarf weed in particular suffers from a supply surplus in relation to it's demand. I think it's one of the only herbs that isn't really impacted by dxp weekends (current price is the same as the price weeks prior to dxp announcement).
Also, a Dwarf Weed seed dying has a larger impact than a Lantadyme seed dying.
So do DW if you need XP, or Lants if you just care about the money. Obvious answer is obvious.
I am a really experienced farmer who wanted to know what the profits for all main herbs were. And instead of just using estimated rates. Like 10 number of herbs per seed. I use averages from currently 269 dwarf weed runs to estimate yield for each combination of juju/no juju and tier of greenfingers. I do this and estimate the profit for each herb under each category to see which herbs come out on top.