I think you're burning it, it's not a plant that wants direct light, I mean the Pothos.

That Fittonia is likely to suffer from that too, it's an understory plant, not for direct light either, also needs terrarium (or bathroom) humidity.

I wouldn't give the Peace Lily direct light either.

Nice idea & pretty plants, but I think their needs differ from what you're expecting. I doubt they want or need supplementary light, especially not in an office, where plants can thrive under just office light.

I've bloomed a mini Peace Lily in my office, no windows, just office light. Have a Schefflera there too, also thriving.

I also think twice a week is a lot of watering, maybe too much.

I'd re-think this, I think (IMO) in this case, less is more, this all seems like overkill to me. Guess I would have tried the set up w/out the lights first. Sorry, but you are asking opinions & troubleshooting.

Hmm, okay. Just to clarify I don't use the overhead fluorescent lighting in my office. I use two lamps. When I'm not here, which is 4 days out of seven, the lights are off completely. So, without the supplemental lighting, which is on the 'low' setting, the plants would be in complete darkness during that time period. I can adjust the timer so that the lights are not on when I'm here, but I'd be concerned about the plants not getting *any* light the majority of the week.

Ah, okay, so I was over-correcting. I'll back off the water. When I check, I'm gently wiggling a finger down knuckle-deep in the pot. The plants are never just swamp-wet, but they have been kept damp because my initial concern was 'not enough water.'

They need to dry out a little more between waterings.

Knuckle deep doesn't tell you much about how moist things are deeper in the pot.

Get a wooden down and sharpen the ends.

Stick all the way into the soil to the bottom. Pull it out immediately and inspect.

If it comes out dark, damp and stained with soil, don't water.

Check every couple days and water again when the dowel comes out clean and dry.

I have that same pothos in a southern window and it loves it there. I would be reluctant to grow it without sunlight. Actually, I feel really bad putting plants in dark corners where they get no indirect or direct light.

I know people label plants "low light" and say certain plants can live in dark spaces, but I've found that even those plants like a little light. A room with no windows at all and not even flourescent light? I'd be very reluctant to place a plant in those conditions....

that said, pothos definitely don't need to be watered that frequently, even in full sun.

eta: they would benefit from the fluorescent lights. Perhaps leave them on sometimes when you are in the office...

I agree Lauren, my marble queen gets full sun and it gets watered maybe once a week.

Beautiful!! So pretty!

Here is mine that gets full sun. It's still a wee thing: