Stinking chamomile

Stinking chamomile (Anthemis cotula L.) is an annual herbaceous plant belonging to the Asteraceae family. Often referred to as dog fennel, it is recognized globally as a significant agricultural weed that competes with crops for nutrients, water, and sunlight, often causing notable yield reductions in grain and row crop fields.

Originating from the Mediterranean region, this species has successfully naturalized across Europe, North America, and other temperate regions worldwide. It thrives in disturbed habitats, including arable land, roadsides, and waste areas, showing a strong preference for nitrogen-rich, damp, and fertile clay or loam soils.

The plant is distinguished by its strong, unpleasant odor and glandular hairs covering the stems and leaves. It grows up to 60 cm in height with a branched structure and finely dissected, fern-like leaves. Its daisy-like flowers possess white ray florets and yellow disk florets, blooming from early summer through the autumn months.

Agronomic management of stinking chamomile relies on integrated weed control strategies, including crop rotation, competitive planting, and timely mechanical cultivation. Because a single plant can produce tens of thousands of seeds, preventing seed set is critical to reducing soil seed bank density over successive seasons.

• Requires well-drained but moist soils for optimal growth.
• Highly prolific seed production poses a long-term management challenge.
• Can be detrimental if mixed into forage due to its acrid taste.

Although it has no significant agricultural use, it is sometimes studied for its phytochemical properties. Typical pests include aphids, while common diseases involve various fungal pathogens like powdery mildew, particularly in dense stands with poor air circulation during wet seasons.