Hard to say, can you elaborate on the description pls? Are the leaves thin or thick to the touch? From yr. desctiption of the stem, if it's not a Diff. as suggested above, pls. check if it's Aglaonema (Chinese Evergreen). Pls. do a search (then isolate the search to Images) to see if the pix match yr. plant. Yellowing leaves can be signs of BOTH underwatering or overwatering, more likely that than lack of light. It's hard so say more or give further advice w/out knowing exactly what plant you've got.

It's sometimes referred to as strawberry begonia.

I'll be a contrarian tonight and disagree. Before Stitz jumps from underlines and bold to italics, consider the following: 1. We aren't dealing with a white phal or a yellow oncidium. 99.9999999999% of these types of intergenerics available to the public are clones, not seedlings. So its fair to assume that this is a clone. Thus, a bit of judicious research into available clones could very well net you an ID. "Very similar to" in this instance, I posit, does indeed count! 2. Unlike the millions of white phal seedlings, I don't believe you'll even be able to find even 3 different intergenerics the look identical to this. I challenge you to find them now...I'll wait...were you able to find anything? 3. Considering this, I believe the markings are far too distinctive to dismiss off hand it as unidentifiable, right down to the yellow below the column. Compare to this ID'd marfitch from Elk Grove Orchids, keeping in mind the *faint* differences in spotting and color, assuming they are one and the same, are wholly attributable to different growing temperatures (google M'HD' and you'll find wide variation in the coloring and spotting). The one in this pic, based on the purple color and high proliferation of spotting, was grown slightly cooler. 4. You can't off hand claim every tagless plant is unidentifiable. We ID a bunch here and on another forum all the time! ANDREA: 1. Can you post a photo that is face on to the flower? My 2 cents. I don't lightly ascribe names to every tagless plant. However, this is one instance where I personally believe the plant IS identifiable, and I stand by the positive ID of Beallara Marfitch 'Howards Dream'. You are naturally welcome to disagree :) I'll agree with Howard though, whatever it is, its beautiful!

i will be the second or third person to tell you it NOT A WATER issue... but continue to ignore such if it makes you happy ... you arent doing harm with your idea.. but it isnt going to solve the problem .... my bet is .... and i see you are rooting more plants in the same pot.. that you have significantly OLD MEDIA.. that is used up.. and not allowing proper MOVEMENT OF WATER THRU THE WHOLE ... its still a water issue.. but not the one you are fixated on ... get those babes their own pots.. and repot the big one ... and if it dies.. you still have it.. because those cutting are the same plant.. exactly ... and move them closer to a window.. as there may not be sufficient light in what looks like the middle of the room ... there is a houseplant forum if you wish to delve further into the proper culture of houseplants ... all this is that your mom would have done if she was any kind of houseplant gardener .... the best idea.. would be to pot up the little ones fist.. and in a month or so.. when they are all fat and happy.. and your have your failsafe.. you can give it a go on the big one ... and what they said on the lowest leaves falling off... they do that annually.. no plant holds it oldest leaves forever ... and just to be sure.. potting media is NOT dirt from the yard ... good luck ken