I start morning glory plants from seed in Februrary-March each year, and then plant them outside so they can grow up the trellises that I have stationed around the yard. Beginning in August, they bloom non-stop for several weeks. This year I didn't start them until the middle of April, and only two have survived so far. They have a lot of growing to do between now and August.
Normally I hate the blasted look created by the pop-up flash. So, when I have to use it I like to put some tissue paper or even a Kleenex over it to diffuse the light, which helps bring down the intensity.
In this case, I stuck the metal rim of a work light (with the bulb removed) around the pop-up flash, directing the majority of the light up, so it fell softly down onto the plants, letting them glow out of the darkness.
Nikkor 18-105mm f3.5-5.6
105mm - ISO 800