Lepidium latifolium aka Dittander

Lepidium latifolium, or dittander, belongs to the cabbage family, Brassicaceae. It is a herbaceous perennial that loses its leaves each year. Its native range covers temperate Eurasia, North Africa and the Arabian Peninsula. It is also native to Britain and Ireland. Other common names include dittany and berwr gwyllt. Wild habitats include salt marshes and wet coastal sands.

The plant grows upright, with branching stems and a tall outline. In gardens, it reaches about 4.9 feet [1.5 metres] high. Its spread can reach 3.3 feet [1 metre]. Plants reach their full size in one to two years. The green leaves have a waxy surface. Their shape ranges from oval to narrow and pointed. Leaves at the base can reach 1 foot [0.3 metres] long. These lower leaves can be 0.23 feet [0.07 metres] wide. Small white flowers form tight groups at the stem tips. Each flower has four petals. The flowering season runs from June to August.

Grow dittander in full sun with soil that stays moist. The RHS also suggests planting it beside pools. Its soil guidance includes clay and loam, with poor drainage. Acid, neutral and alkaline soils all suit it. Plants can grow in open or sheltered sites. The RHS gives it a UK hardiness rating of H4. Plants For A Future lists USDA zones 5–9. Suggested settings include wildflower meadows and gardens for wildlife. Its height and summer flowers suit these informal planting schemes.

The RHS reports few routine pest or disease problems. Plants need no regular pruning. Gardeners may tidy them once flowering ends. Seed provides a way to raise new plants. Plants For A Future flags the species as potentially weedy. That warning matters when weighing its use in a garden. The evidence does not define how severe this risk is.

Young leaves can be eaten raw or cooked. Their strong, hot taste suits small amounts in salads. The root can be grated for a sauce resembling horseradish. Seeds also serve as a seasoning. Plants For A Future lists no known hazards. This does not establish safety for pets or every use. The same source records traditional medicinal uses, including digestive, liver and kidney remedies. These are reported uses, not proof of benefit. It also records insecticidal use, but gives no firm preparation details.