Runner Bean Polestar Stringless Variety. One of the most reliable and productive runner bean varieties available, producing an abundance of string less fleshy pods over an extended period from bright red flowers. For the best flavour and sweetness pick when they are no longer than 6″- 8″. Cultivation Advice Pre-prepare growing site with ample organic matter. Sow in early spring under-cover in warmth a single seed 1in depth per pot. Gradually harden off after all risk of frost has passed. Alternatively plant direct outside after the soil temperature is above 50F in late spring. Protect young plants from pests. Ensure plants have support to ramble (canes / wire / netting). Keep well watered whilst flowers are setting. Pick regularly to encourage the plants to keep flowering.