Competitiveness of the Exotic Silphium perfoliatum against the Native Urtica dioica: A Field Experiment

Table 1

Precipitation sum and mean air temperature (based on 24 h mean values at a height of 2 m) over the growing seasons (April to August). Data were measured in the Ecological Botanical Gardens by the Micrometeorology group of the University of Bayreuth.

Year	Growing season	Precipitation sum (mm)	Mean temperature (°C)
2019	1	226	15.7
2020	2	318	14.8
2021	3	342	13.7
2022	4	195	15.8