Surprisingly, natural dye extracts have been around for sometime but are now much more widely available. Compared to collecting your own plant material they can be expensive. They are quite concentrated and a little goes a long way. Like other dyestuffs you can exhaust the colour from the extracts by reusing each dyebath. They do extend my colour choices and cut down on the time and energy required to extract the dye from plant material.
Did I mention that I love the smell from these dyepots including the indigo aroma.