A great blend would be 2 roots, 1 bark, then add leaves, berries, flowers. Can add honey for sweetener and lemon for more flavor.
Roots
Astragalus Astragalus membranaceus
Ashwagandha Withania somnifera
Dandelion Taraxacum officinale
Echinacea Echinacea angustifolia
Yellow dock Rumex crispus
Licorice Glycyrrhiza glabra
Ginger Zingiber officinale
Marshmallow Althaea officinalis
Barks
White willow Salix alba
Wild Cherry Prunus serotina
Leaves
Chickweed Stellaria media
Lemonbalm Melissa officinalis
Mullein (flowers and leaves) Verbascum thapsus
Peppermint Mentha piperita
Plantain Plantago major
Rosemary Rosmarinus officinalis
Sage Salvia officinalis
Spearmint Mentha spicata
Thyme Thymus vulgaris
Yarrow Achillea millefolium
Flowers, Berries, and Seeds
Calendula Calendula officinalis
Chamomile Matricaria recutita
Elder (flowers and berries) Sambucus canadensis
Yarrow Achillea millefolium