Cardaria draba (whitetop) is a perennial weed, with a pivoting root that is very branched on the superior side. It prefers skeletal, clayey soils, that are rich in calcium and located on areas with moderate climate.
Common names: whitetop, hoary cress, or Thanet cress.
The stem is vertical, with branches on the superior side. It is edgy and it has grey hairs. The stem can grow up to 50-cm high.
The cotyledons are oval and with straight margins and rounded tips.
The real leaves are elongated, elliptical to lanceolate. The leaves are not shiny and the limb suddenly stops on the petiole. The first 3-4 leaves are straight and hairless and the following are lacy to serrated and with short hairs. Before blossoming, the leaves turn yellow.
The flower is small, white and it has a pleasant scent. The flower is grouped in cymes. The petals of the flowers are two times larger than the sepals, that are green to yellow.
The blossoming period is late spring and it can extend until summer. The plant produces around 1200 to 5000 seeds.
How to fight this pest plant
The herbicides that are recommended when fighting the whitetop are: Dicopur Top, Esteron Extra, Galigan, Goal 4F, Merlin Duo.