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in Tools and techniques
Runners are hungry plants, so see if you can buy some composted manure (most garden centres will have it.) They also act as a sail in the wind, so tie the top of the canes to something solid nearby (if you can) to prevent them blowing over. The deeper the pot the better.
Add some JI2 (you don't need 3, they are not mature, established plants which is what 3 is for) to whatever you use. As they are going to be in a plastic pot, they will need the weight to stop them falling over as the runners get bigger. Are you growing the sweet peas with the runners? You may find that as the runners are large strong plants that the sweet peas get overrun - runners are pretty enough to go it alone, then you will get the full benefit of the sweet peas elsewhere. When runner beans were first introduced they were classed as an ornamental because of their lovely flowers.
correct soil composition in which to plant sweet pea seeds (flowering scented)