When you're in Imperial City go through the entire city and look for Fly Amanitas and collect all of them.

When you leave the city to the Walnut Inn go around the the stone walls and get some summer boletes, lavender spring, and a lot of morning glory.

Then mix these potions together for burden then sell all of them.

When in Skingrad go pick all grape vines and then go around and pick up all the flax seeds, elf cups, emmeritas, alkanets, and lady smocks.

Mix together and sell those potions for a lot of money.

It will build your money and mixing ingredients go up faster in level.