tiny boquet

I am enjoying the splash of color on my balcony so much, I cut a few nicotiana flowers to bring indoors in a small jar. Four plants are flowering now, each with a slightly different shade of purple. As the flowers age they fade, varying the colors more.

The older plants are tallest and starting to fall over somewhat; I wonder if the containers are not big enough for their root spread? Younger plants are starting to produce bud stalks, but lower on the plant. I'm watching to see if those shoot up even taller before the flowers open as well.