I like FoxFarm potting mix, it already comes pH, has great nutrients.
Happy Frog® Potting Soil
Your potted plants deserve the best. Their roots can’t seek out nutrition in the ground, so you have to bring it to them. That’s why Happy Frog® Potting Soil is amended with soil microbes that can help improve root efficiency and encourage nutrient uptake.
Between the earthworm castings, bat guano, and aged forest products, your container plants have never felt so good.
If you want to give your potted weed the best care, give then enough nutrients right from the ground. You can do this by feeding your crop with Happy Frog Potting Soil, which is rich in fungi and beneficial microbes. The two ingredients help to break down the organic matter in the ground so that the weed roots can get the nutrients they need. Some of the organic matter contained in the soil is bat guano, earthworm castings and forest humus.
FoxFarm manufacturers high quality products so you do not have to worry about your weed getting ineffective ingredients. The soil, highly recommended for weed planted in containers, comes ready to use. The pH of the soil adjusts instantly allowing a maximum intake of nutrients by the crops. The benefits derived from the soil are stronger plants, active vegetative growth, better, and more production. The soil has an aerated pH., light texture and ideal for all container plants. It contains no top soil, no fillers and no sludge. The soil comes in a 2 cubic foot bag and weighs 45 pounds.