Rotklump

Rotklump is a term used in horticulture to describe the mass of roots and the surrounding soil that clings to a plant’s root system, typically when the plant is dug up or prepared for transplantation. The rotklump includes primary roots, lateral roots, and the adhering soil, and may be bound together by fibrous roots and organic matter. The size and density depend on species, age, and growth conditions, and are related to the size of the root ball in a container or the plant’s field root zone.

In practice, the rotklump functions as a transportable planting unit. When transplanting, keeping the root ball intact protects fine roots and preserves soil structure and mycorrhizal connections. Handling guidelines include keeping the ball moist, avoiding excessive disturbance, and lifting the plant by the root ball or wrapping it in burlap to stabilize during movement. After placement, backfill to the original depth and water thoroughly to settle the soil around the roots.

Common issues include a dry, compacted, or overly small root ball; circling or bound roots in container-grown plants; and signs of transplant shock after planting. Remedies include soaking the root ball before planting, choosing an appropriately sized planting hole or pot, and gently loosening circling roots or pruning them if necessary. Proper handling of the rotklump contributes to establishment and overall plant health after transplantation.