If you only need a few fools cap a day for potions then I would suggest getting your farming up so you can plant enigma seeds. I was growing the bells for motes to trade in 1.6 a day or 9 every 2 days but I am finding with the herb seed I get 5-6 lotus a day and 10-12 of the other herbs. If your only need is for a potion here or there this would be the least time consuming and most efficient way to make a dozen of each herb (not lotus obviously) a day.
If you are mass consuming them for inscription then I would suggest both farming and gathering. I have also located other out of the way places that grow fools cap that have supplimented the briney muck after I have checked the muck. There is more aggro but I am over geared for the aggro so its not a big problem.