"Dandelion roots are best harvested from late fall through early spring, when the plant is dormant and has stored up energy in the root. For medicinal use, most sources say fall harvest is best... Spring roots will be less bitter and chewy – just make sure you dig them before the plants start to blossom. Spring roots are also higher in taraxacin, which stimulates bile production."
Do you like to eat salads? This green leaf contains more nutrients than all of your salad greens combined. Dandelion leaf is a mineral rich, bitter tonic that is one of the best herbs to munch on in summer salads. Why Should You Eat Dandelion Greens? » Living Awareness Institute