One of the few successes I have had is growing the blue pea flower. This is because, different from most things I have tried to grow, I got the seeds from a neighbour’s plant, so I was growing in the same environment.
The flowers can be used to make detox tea:
When you squeeze some lemon juice into the tea it becomes purple, as shown below:
Or it can be used to make blue rice, which is rather attractive:
Or, it can be used to improve the soil, as it is a legume and fixes nitrogen in the soil. I use it as a companion plant with my passion fruit vines.
How to grow:
Plant seeds in potting mix and transplant into a larger pot or the ground when the seedlings are an inch or two high.