My tall pink flower in the raised bed – is it a sweet pea, and how can I keep it flowering?

The plant you refer to as “mine” in the raised bed looks like a sweet pea or tall pink-flowered pea type, with climbing or support-seeking stems and bright pink flowers along them. In the photograph it forms a large, airy clump with many open flowers above the rest of the border, which fits a sweet pea better than godetia or clarkia.

What will help it keep flowering

Since you want better flowering, the most useful step is to remove faded flowers and regularly cut fresh ones for a vase. Sweet peas flower for longer when they are prevented from setting seed. In an outdoor raised bed they also need consistent watering, particularly once the plant is as large as this. If the soil dries out severely between waterings, flowering often becomes shorter and sparser.

A weak feed for flowering plants at regular intervals can help, but avoid too much nitrogen: that can produce lots of leaves and long stems at the expense of flowers. If the stems start to flop, provide a little extra support so that buds and new side shoots receive more light and air.

How to recognise it

The height, narrow and fairly open habit, and pink flowers scattered up the stems all suggest a sweet pea here. The photograph was taken from some distance, so I would not promise an exact variety, but the general type of plant looks fairly clear.