Lupins (Lupinus spp.) are showy annual or perennial blooming flowers from the legume family, that are native to North and South Americas and the Mediterranean. Large clusters of showy pea-like flowers develop along stems on long stalks. Leaves are alternatively arranged and fan-shaped with 5-13 leaflets. They produce flat, oblong-shaped seedpods that hold seeds.
Lupins contain quinolizidine alkaloids, which interfere with normal function of the nervous system. The seeds and seedpods contain the highest concentration of toxins.
- muscle tremors
- loss of appetite
CHEMICAL CONTROL: Lupine can be controlled with 2,4-D (1 kg ae/Ac), 2,4-D + dicamba (0.5 + 0.25 kg ai/Ac), or trichlopyr (0.25 to 0.75 kg ae/Ac). Spray actively growing plants after they are 10 cm high but before they bloom. Re-invasion is rapid and re-treatment may be necessary every 4 to 5 years.