Grow & Cook Your Own Runner Beans Runner Bean Scarlet Emperor: Scarlet Emperor is excellent for freezing & a heavy cropper, also popular as a show vegetable. Harvesting time is from August to September. Runner Bean Streamline: Streamline is a reliably heavy & vigorous cropper, also suitable for freezing. Harvesting time is from June to September. This selection of runner beans contatins two varieties. These Beans will produce plenty to harvest & any excess can be frozen & eaten at a later date.