Brighter today:

not really;  playing with the python control interface, and using the sample from the docs, have set the camera to brighter settings, almost night mode.

Still using very small opening, to get the largest area in focus. Each one of the mounds of soil is ~3 cm across, so the plants in the foreground are 30 cm closer than those in the back;

Have set the shutter speed to ~ half a second, and a low frame rate.

The plants have a lamp above them, but off to the right (in the picture) is a north facing window.

Trivia, it is snowing outside here today, so will be a while before these get moved outside…