What term describes seeds that are capable of germinating under less-than-optimal conditions?

The term that describes seeds capable of germinating under less-than-optimal conditions is "viable seeds." Viability refers to the seed's potential to germinate and develop into a healthy plant, which encompasses its ability to withstand various stressors, such as drought, poor soil quality, or temperature fluctuations. Viable seeds can maintain their germination capacity even when environmental conditions are not ideal, making them essential for successful plant growth and agricultural practices.

In contrast, "stale seeds" typically refer to seeds that have lost their germination ability over time or due to poor storage conditions. "Robust seeds" is not a standard term in seed science and thus does not convey a specific meaning regarding germination under varying conditions. "Hybrid seeds" refer to seeds produced by crossbreeding different plant varieties, specifically aimed at enhancing certain traits, but this term does not directly relate to their ability to germinate under stress.