Representative pots for each hemiparasite seed-source treatment (‘cross’, ‘home’, ‘naïve’) and the uninfected control. Solidago gigantea (left) and Symphyotrichum lanceolatum (right) are infected by Melampyrum arvense (top) or Rhinanthus alectorolophus (bottom). The bottom photo is flipped vertically for clarity of the experiment presentation. Photographic documentation of all experimental pots is provided in Suppl. material 1: appendix S4. Scale bars: 50 cm.