Plant turtle bean seeds in spring when the soil temperature reaches 60 degrees Fahrenheit. Push the seeds to a depth of about 1 inch, spaced 3 inches apart in rows separated by about 30 inches.
Control weeds between rows with a tiller or a hoe.
Monitor the bean plants for insects such as Mexican bean beetles and leafhoppers. Use an insecticide such as carbaryl or malathion.
Pick turtle beans by hand when a high percentage of the leaves have fallen and the pods are no longer green. This occurs somewhere between 90 and 100 days after planting in most conditions.
Check the moisture of the beans using a moisture meter. Beans must have a moisture level of between 16 percent and 18 percent to prevent spoilage. Monitor the stored seeds and use a dehydrator to dry the bean seeds if there is any sign of the start of spoilage.