Climbing Beans Raadsheer - Buzzy. Sow in open ground from mid-May to July. The simplest cultivation method is using tonkin sticks in rows. Plant 3–4 beans per stick (approximately 3 cm deep). Raadsheer flat beans produce long, flavourful, stringless pods; don’t leave them hanging too long. Also suitable for cultivation in hobby greenhouses and can be sown in mid-April.