A short term greenhouse study examined spotted knapweed and bluebunch wheatgrass responde to competition (intra- and inter-specific), light and defoliation treatments. Collections of 405 mature plants of spotted knapweed and bluebunch wheatgrass were made in May. Three competition treatments (intra-specific spotted knapweed, and two levels of inter-specific spotted knapweed/bluebunch wheatgrass) were created in the greenhouse pots. Nine combinations of defoliation treatments (control, 75% removal at bolt stage of spotted knapweed and 50% removal of bluebunch wheatgrass at vegetative state, and monthly defoliations removing 50% of both species for 4 months) and light treatments (full light, 2/3 sunlight, and 1/2 sunlight) were applied.
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