"播种用的玉蜀黍" can be translated into English as "maize (corn) for sowing" or "seed maize (corn)".
Here, "玉蜀黍" is the Chinese name for maize or corn, and "播种用的" indicates that it is intended for sowing or planting purposes. Therefore, "seed maize" or "maize for sowing" accurately conveys this meaning in English.