Plants that have taproots can be divided by using a sharp knife to slice down the length of the root. Every piece that has at least one eye, some of the taproot, and a few side roots is a viable division.
Plants that have taproots include balloon flowers (Platycodon grandiflorus and cvs., Z 4–9), butterfly weeds (Asclepias tuberosa and cvs., Z 4–9), cushion spurges (Euphorbia polychroma and cvs., Z 4–9), Oriental poppies (Papaver orientale and cvs., Z 4–9)
In this video, author and instructor Janet Macunovich demonstrates how to divide perennials that have taproots.
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