“I realize that you sell several potting soils. The one that I want to use to make soil blocks is your organic potting mix. Do I need to add anything besides water to it to act as a binder?” Ken from Washington State
Answer: Black Gold Natural & Organic Potting Mix is perfect for seedling block making. All you need to do is fully moisten the soil, gather it in a pile, and punch it down with a soil block maker. The compacted blocks should be firm and stay together when handled. Then place them in leakproof flats with no bottom drainage holes. No extra binder is needed. This method is nice because it offers a plastic-pot-free way of starting seedlings.
Black Gold Horticulturist