wortelknolletjes

Wortelknolletjes are small, tuber-like enlargements that can form on the roots of some carrot plants (Daucus carota) or related species. The term is Dutch and translates roughly to “carrot little bulbs.” These outgrowths appear along the main carrot root and resemble tiny bulbs or nodules, varying in size from a few millimeters to about a centimeter.

Formation and causes: Wortelknolletjes are not a distinct species or cultivar but a morphological variation that can arise under certain conditions. They are associated with genetic predisposition in some varieties and with environmental factors such as heavy or compact soil, irregular irrigation, nutrient imbalances (especially nitrogen and potassium), and temperature fluctuations during root development. Storage conditions after harvest can also influence their development, particularly in roots stored at fluctuating humidity and temperature.

Impact and use: The knolletjes are edible but can alter texture and uniformity, making peeling and processing more labor-intensive. They do not pose a safety risk, but they are typically considered a fault for standard-market carrots due to appearance and handling issues.

Cultivation tips: To reduce occurrence, aim for well-prepared, friable soil; maintain even soil moisture; avoid over-fertilization with nitrogen; provide uniform spacing; harvest before roots become overly mature; and store roots in cool, humid conditions to minimize further outgrowth.

See also: carrot morphology, root tubers, carrot storage.