According to the back of the package of seeds they need little care to thrive. They are not fond of heavily fertile ground and need a minimum of water.
It seemed to be a perfect plant to put in the flower box under the kitchen window this spring.
I had to plant the seeds twice. I add a little fertilizer the second time and a few seeds sprouted. I watered faithfully and was beginning to see colorful flowers when the plant on the far end began to look sickly.
Looking closer this is what I saw . . .
In disgust I stopped watering and made a mental note to self . . . it is possible to be TOO nasty to nasturtiums.
On the other side of the yard -- I love this trumpet vine. In the cool of the evenings when I sit next to an open window I can smell its fragrance.