Botanical atlas

Yellow Foxglove

Digitalis grandiflora

Digitalis grandiflora belongs to the same storied genus that gave the world one of medicine's most important heart drugs. Its cousin, common foxglove, entered Western medical history in 1785 when the English physician William Withering traced a folk remedy for dropsy back to a Shropshire healer's herbal mixture and identified foxglove as the active ingredient, eventually leading to modern digoxin. Yellow foxglove has long been grown in cottage and woodland gardens for its gentler, more graceful color, prized as an ornamental rather than gathered as a household herb. Its story is really a caution wrapped in beauty, a reminder that some of our most powerful medicines began as plants far too dangerous to use without exact laboratory measurement.

Safety.

Every part of Digitalis grandiflora contains cardiac glycosides (cardenolides) that are dangerously toxic if eaten, including the leaves, flowers, seeds, and even the water in a vase that has held cut stems. Ingestion can cause nausea, vomiting, blurred or yellow-tinged vision, irregular heartbeat, and in serious cases death, and the plant is equally toxic to dogs, cats, horses, and livestock. People taking heart medications such as digoxin, diuretics, or other cardiac drugs are at particular risk, since this plant is the botanical relative of the drugs themselves. Handling the foliage can also irritate sensitive skin, so gloves are wise when planting or dividing it. This is a look-only, admire-from-a-distance garden plant, never a home remedy. If you suspect any part has been eaten, treat it as a medical emergency and contact Poison Control or a doctor immediately, and always garden with children and pets in mind when choosing where to plant it.