<p>Allelopathy refers to the chemical interactions between plants, where certain species release substances that affect the growth of others. This mechanism is particularly relevant in the context of invasive species, though studies on its effects in agronomic crops remain scarce. This study investigated the allelopathic potential of <i>Hedychium coronarium</i>, <i>Ligustrum lucidum</i>, and <i>Senecio inaequidens</i> on the germination of pearl millet (<i>Pennisetum glaucum</i>) and sudangrass (<i>Sorghum sudanense</i>), aiming to assess their impact on crop rotation and sustainable agriculture. Seeds were treated with ethanolic extracts of <i>H. coronarium</i> and <i>L. lucidum</i>, and hexane extract of <i>S. inaequidens</i>. These were compared with distilled water (negative control) and a Tween 80 solution (positive control). The results revealed that all extracts had significant allelopathic effects. <i>H. coronarium</i> and <i>L. lucidum</i> caused a hormetic response in pearl millet and dose-dependent effects in sudangrass. In contrast, <i>S. inaequidens</i> extract inhibited germination in both species and significantly reduced the germination velocity index. These findings indicate the potential use of such extracts in managing plant growth, suggesting possible applications in weed control and vegetation management in agriculture. Further research is needed to identify and characterize the active compounds, supporting the development of natural bioherbicides.</p>