Am attempting to dry some watercress for my first alchemical experiemtn but have found it difficult, perhaps its due to the high water content in watercress, it basically dosen't dry too well just goes bad by the look of it... made a mistake in trying to heat it in the oven to drive the water from it, some sucess I suppose but I'd rather use another herb that can be bought dry and ready to use.

Any resources available that list plantery correspondances for P.Alchemy?

Thanks
.M.