In a small room, one large plant does more than six small ones. That is the whole case for a statement plant, and it is a good case, but it comes with a bill: the plant is going to occupy a position that costs you real floor, in a room that does not have floor to spare.
So the question is not which plant makes a statement. It is which position in your room can afford one, and whether that position has the light.
Why one large beats several small in a small room
Three reasons, and none of them is really about plants.
A single large object gives the eye somewhere to rest. Several small ones give it several places to go, which in a small room reads as busy rather than green.
Height uses volume the room was wasting. Small apartments are short on floor and surface but usually have as much vertical space as large ones. A tall plant spends the resource you have most of.
Fewer, larger objects make a small room read larger. The opposite instinct, scaling everything down to match the room, tends to make it read smaller and more cluttered.
That is the design argument, and it holds. Now the constraint.
The position has to satisfy three things at once
Most rooms have positions that satisfy one or two. The whole difficulty is finding one that does all three.
Enough light for the plant you chose. The University of Illinois Extension puts Bright Light at an east or west window directly in front or a south window up to 5 feet away, Medium at a north window directly in front, an east or west window a few feet away, or a south window 3 to 10 feet away, and Low further back than that. A large plant that wants Bright and stands in Low is a large plant declining slowly and expensively.
Floor you can actually give up, permanently. Not floor that is free today. Floor that will still be free when you have visitors, when you buy a chair, when the room gets rearranged. A statement plant that keeps being moved is not a statement, it is a nuisance.
Clearance from traffic. In a small room, the bright positions are frequently on the routes between things. A large plant with big leaves standing in a walkway gets brushed every day.
If no position satisfies all three, the honest answer is that this room does not have a statement plant position. That is a real finding and it is better to reach it before buying than after.
Where those positions usually are
In practice, in a small apartment, the candidates are few and predictable.
The corner beside a window. The most common good answer, because it has light from one side and it is out of the traffic by definition. Tall plants for corners covers what that position supports.
Beside a window, against the wall. Bright, and usually out of the path if the window is not a door.
Set back from a south window. Per the table, a south window gives usable light several feet into the room, so the plant does not have to be at the glass. This is often the position with the most floor available. What a south-facing window delivers covers how far that reach goes.
Framing something. Beside a sofa, at the end of a run of furniture, or where a wall changes direction. These read as intentional rather than as a plant that had nowhere else to go.
Choosing the plant, without me choosing it for you
I am not going to recommend a species, because the right one depends on which of the three constraints is tightest in your room. What is worth insisting on is the checking.
Check the mature size by botanical name, on the grower's label or a university extension page, not by the size in the shop. A plant bought as a statement is bought to grow, and how large it eventually gets is the whole point and the whole risk.
Check its light requirement against the band your position actually is, using the distances above rather than an impression of the room being bright.
Prefer a habit that grows up rather than out, if floor is the tight constraint. Two plants of the same height can have very different footprints.
Be honest about the ceiling. A plant whose mature height exceeds your room's is a plant you will be topping or replacing.
The mistake that undoes the whole idea
Buying the statement plant first and finding the position afterwards.
It is the natural order, because the plant is the exciting part and the position is admin. It also reliably produces the most common outcome in this whole subject: a large, expensive plant standing in the only place it fits, which is the place the light does not reach, slowly becoming the least attractive thing in the room.
Find the position, measure its light band, then choose to suit it. The plant chosen for a position that exists will always outperform the position found for a plant already bought.
In a studio, this is a harder call
A studio has one room doing every job, so a position that is permanently given up is given up by every function at once. What actually works in a studio apartment covers that trade properly, and it is worth reading before committing floor in a one-room home.
If you have pets
A floor-standing plant is at animal height by definition, and a large one is the most reachable plant in the room. Check the species, by botanical name, against the ASPCA's toxic and non-toxic plants database before it comes home.
Frequently Asked Questions
Is one big plant really better than several small ones in a small room?
For a small room, yes, and for three reasons that are not really about plants. A single large object gives the eye somewhere to rest, while several small ones give it several places to go and read as busy. Height uses vertical volume, which is the resource a small apartment has most of. And fewer, larger objects make a small room read larger, where scaling everything down to match the room tends to make it read smaller.
What makes a position good enough for a statement plant?
It has to satisfy three things at once. Enough light for the plant you chose, using the Illinois Extension's bands rather than an impression of the room. Floor you can give up permanently, meaning floor that is still free when you have visitors or buy a chair. And clearance from traffic, because in a small room the bright positions are often the routes between things. Most rooms have positions that satisfy one or two, and if none satisfies all three, the honest finding is that the room has no statement plant position.
Where in a small apartment do those positions usually turn out to be?
Four candidates come up repeatedly. The corner beside a window, which has light from one side and is out of the traffic by definition. Beside a window against the wall. Set back from a south window, since a south aspect gives usable light several feet into the room and this is often where the spare floor is. And framing something, such as the end of a run of furniture or a point where a wall changes direction.
How do I pick the right plant once I have the position?
By checking rather than by liking. Check the mature size against the botanical name on the grower's label or a university extension page, not the size in the shop, because a statement plant is bought to grow. Check its light requirement against the band the position actually is. Prefer a habit that grows up rather than out if floor is your tight constraint. And be honest about the ceiling height.
What is the most common way this goes wrong?
Buying the plant first and finding the position afterwards. It is the natural order, because the plant is the exciting part, and it reliably produces a large, expensive plant standing in the only place it fits, which is the place the light does not reach.
The part worth remembering
One large plant is the right instinct for a small room. It only works if you give it a position that has the light, the floor and the clearance at the same time, and those three rarely overlap in more than one or two places in a small home.
Find that place first. If it does not exist, the room's honest answer is a group at one height rather than a statement, and that is a good-looking room too.