Poisonous Parts
The sap, flowers, seeds, stems, roots and leaves of the foxglove plant are all toxic if ingested. The largest concentration of the toxin that makes foxglove poisonous occurs in vigorously growing shoots. Even if the plant parts are dried or boiled, the toxic ingredients remain active. While ingesting any part of this plant at any time during its life can be fatal, it is most toxic in the period just before seed ripening. The upper leaves and stems also tend to have a higher concentration of toxin than the lower leaves.