Hi becolly:
I invite you to consider your options: If you are the combination of being patinent while remaining stubborn (as I am) you could (or not) end up with a nicely planted tank with Oscars.
I went planted from day 1. My Oscars where 4 to 5 months old when I got them, likely 5 and 6 when I placed them in their home tank.
I used a methodology in which I combined observation with trial and error. What I keep in mind is that it is their tank, not mine. Some Oscar might not tolerate plants at all, but hopefully yours (as mine) will.
I went from very low end lighted to mid-heavy light tank in a gradual way. Some areas in my tank have actually 4-5WPG while others remain at 1-2WPG. When I started I barely had 0.25WPG.
I provided them a few flat rocks. At this time I tried mostly bundled floating plants (submerged) like Anacharis and Hornwort. Light was too low so I ended up with a lot of plant debris in my filter intakes.
Some bundles were literally disbanded. In the end using clay potted plants turned things around. I use a mix of Eco-Complete and natural river sand in the clay pots. Easy to add ferts by placing a tablet in each. I also use pond intended fertilizer since I keep some pond plants there.
Note that this is my experience with a particular pair of Oscars, not necessarily applicable to other Oscars. My 14" female died last week, a newby sub-adult, 7" unsexed Oscar is in the tank so I will need to monitor things a bit more:
Floating Surface plants (to keep these I built a DIY glass tank height extension but lowering the water level of the tank 3-4 inches should do it):
Water hyacinth (require high to very high lighting). My Oscars moved this free floating plants toward their slate rock, therefor I contain them in that area.
Water lettuce (adapts to low and mid lighting well, in high light might "explode" and cover all tank)
Eared watermoss (same as above except that might not make it in low light)
Duck weed (same as above)
Emersed plants:
Parrot feathers (require high light and frequent fertilization) clay potted only, if left in bundles no luck so far. My problems with this plants are other than Oscar fish (Silver Dollars, Kenyi, Convicts all eat on this plant).
Bundles of Hygrophila difformis (require frequent fertilization, mid level lighting and frequent pruning). Occasional eating from most fish expected.
Bundles of Anacharis (survives in low level lights does better in mid to high).
Heart leaf and Round leaf native plants (failed, I need a somewhat long but shallow clay pot to try these again)
Submerged plants:
Amazon Sword (failed with the Black Sword: uprooted and madly chopped, trying a native Sword at the moment)
Sagitaria (goes well)
Vallisnera species (americana, spiralis, and a dwarf americana variety) in clay pots toward the rear aquarium wall (low light OK but mid is better), mostly successful but they will uproot although not destroy if not happy with its location.
I believe Oscars actually love this plant.
Anubias barteri var barteri (I'm waiting on the giant, gracilis, afzelii). These plants do well as submersed and emerged.
If you enjoy working around your tank (say if you do water changes even when your test results suggest you might make another week without it) then I invite you to experiment. Just start with plants that are not expensive or delicate to keep.
Pepe
Santo Domingo
Anyone who has been keeping Oscars for a while will tell you that they often rearrange their environment. Some people keep plants and Oscars together okay, most of the time, they just rip them to pieces. To be quite honest, I would just leave them to arrange the tank to how they like it. Believe me, you will give up before they do. 
