Six days later the eggs had hatched. and I could find one 1st instar Painted lady (Vanessa cardui) larva on the Common mallow (Malva sylvestris).

caterpillars!
Vanessa cardui (Painted lady)
Malva sylvestris (Common mallow)Location Krimpen aan den IJssel, garden
Observations
2019-VII-012019-VI-302019-VI-28