It is very rewarding to see efforts of my planting coming to fruition when I frequently see lots of butterflies such as the Black Veined Tiger, visiting the plants e.g. Crotalaria retusa, that I planted.
The blue-flowered Stachytarpheta indica is apparently a voracious weed too. I saw lots of them growing in areas where they weren't planted but I am keeping them. Anyway, the ones in this car park were planted and are here for keeps.