Comfrey

Comfrey is a vigorous herbaceous perennial known for its rapid growth and deep root system. It's often used as a dynamic accumulator, drawing nutrients from deep in the soil, and as a compost activist or for making nutrient-rich liquid feeds.

Sun: Full sun to partial shade.

Soil: Moist, well-drained.

Hardiness: H7 — below −20°C.

Flowering: May, Jun, Jul.