Oviposition of Pyrgus alveus agg. has been ovserved on Potentilla verna agg. and Helianthemum nummularium in Bavaria. Here caterpillars were only found on Potentilla verna agg. From the Swabian Alb (Baden-Württemberg) and Switzerland, only Helianthemum nummularium is mentioned as an egg-laying and larval food plant. For Thuringia, Saxony and Lower Saxony, however, Potentilla species are given as oviposition or host plants. Potentilla argentea agg. is another potential food plant that was found to be used in Saxony and potentially in Bavaria in sand and silicate grasslands. Other cinquefoil species found on dry, poor grassland must also be considered potential host plants.
