YES, IN THE BEST-CASE SCENARIO, preparing to save seeds starts with decisions about what variety to plant in the first place, and rouging out weak and then “off types” that don’t measure up, or conform to the desired traits of that particular tomato or squash or zinnia. Inferior or atypical? Out you go!It’s a process that is repeated throughout the life cycle. For instance, you might pull the lettuce seedlings that are slowest to germinate from your row or cellpack; later pull and eat any with off-type foliage, and perhaps even rogue a third time if some individuals prove more inclined toward disease than others. Only let the best and brightest go to seed and provide the genetics for next year.Want to guard against inadvertent cross-pollination? A chart in the OSA’s guide clarifies what crops are vulnerable (and what close cousins they can cross with—such as carrots with wild Queen Anne’s lace, or that many brassicas, such as Brussels sprouts and kale