Marigold varieties readily hybridize through insect pollination. While flower color can influence pollinator attraction, the primary factor determining successful cross-pollination between marigolds in Texas is their species and, more specifically, their compatibility within the Tagetes genus. For instance, French marigolds (Tagetes patula) will readily cross-pollinate with other French marigolds, regardless of color, but are less likely to cross-pollinate with African marigolds (Tagetes erecta). Proximity also plays a role, with closer proximity increasing the chance of cross-pollination. Therefore, planting different varieties in close proximity will encourage hybridization, potentially resulting in new color variations and traits in subsequent generations.
Controlling cross-pollination is crucial for seed saving and maintaining varietal purity. Gardeners aiming to preserve specific marigold traits should isolate different varieties by distance or employ physical barriers like netting. Conversely, open pollination can lead to exciting new hybrids, contributing to the diversity of marigolds in a garden. The warm climate and long growing season of Texas provide ideal conditions for marigold seed production, making it a suitable location for intentional hybridization. Historically, open pollination has been a major driver in marigold diversification, resulting in the wide array of colors and forms available today.
