So once again I revamped this, mostly adding the new planes, and adjusting the sizes here and there.

LESSER PLANES:

Stars and Galaxies:

Stars produce energy that can be absorbed by a grower, galaxies contain even more stars that are much the same just more numerous. Even beginner growers are able to grow past galactic size thanks to the properties of stars.

Universe-Omegaverse:

The 'verses from universe to omegaverse have mosly the same properties with minor differences between. Much like stars before universes produce a certain energy which can be absorbed by a grower. Since a multiverse like any other 'verse contains near countless 'verses a grower can absorb a great amount of energy from the drifting 'verses. This number of 'verses differs depending on which 'verse you are in.

Cloud(s) of Existence:

The clouds of existence unlike the previous planes do not have a barrier of any kind. The reason for this is that the fabric of time coming up absorbs all of the energy produced by the clouds of existence. The fabric of time does this so it can keep time stable even when it is ripped by any phenomena. The "clouds" of the existence clouds are actually the residual energy produced by trying to create a barrier. It is similar to the waste a living being produces after eating, the fabric of time takes all the energy that is being produced by the clouds and then leaves behind the unusable energy. Because of this omegaverses have a sea of "waste" energy to keep them afloat.

GREATER PLANES:

The Fabric of Time and Space:

Ripping through this delicate fabric does not cause any grand cataclysm despite what one may think. The only thing that does happen are power surges similar to the breaking of an astronomical barrier. This power surge however is much greater than the previous ones. The power produced by these surges are at most 492,000X greater than any previous astronomical power surge.

Side note, after any person reverses their growth a swatch of time farbic is left behind. These swatches act as time capsules containing the time frame the person grew. This happens because the growth did happen, however it has been removed from the current existing time frame similar to editing a scene out from a roll of film.

Infinity Plane:

Breaking through the barrier of the infinity plane results in a power surge with a far greater output than that of ANY of the lesser planes. In ratio to it's size the infinity plane has an energy output on average 1,000,000X greater than any previous astronomical power surge. In turn if a person growing absorbs this energy output they will experience a grow surge making them a minimal of 1,000X larger than the diameter of the infinity plane.

Void Plane:

The void plane is certainly a massive plane, however that is the only thing unique about it. It's barrier is the weakest (in ratio compared to its size) of any astronomical barrier before or after it. It is here that evidence suggests that Eldritch, an upcoming plane, is absorbing energy from other planes to make itself a stronger plane.

Infinivoid Plane:

The infinivoid is much like the void plane before it, however it has even less energy output within it. One thing to note however is that its barrier is much more sturdy than any others before it, this is because Eldritch has strengthened it from the outside. Because of this some astronomical growers exerience great trouble getting through this barrier. Much like hardened steel however it is brittle and can be broken, but it does require great force.

Eldritch:

A truly curious and unique plane. As previously stated this plane aborbs energy from not only the void and infinivoid planes but the plane of non-existence that lies outside of it. Eldritch has energetic properties that can absord energy let off by an astronomical grower causing the person to feel like they are growing however they are not growing even an inch. Even though Eldritch is constantly absorbing any energy that is produced by the three neighboring planes, it expels so much energy simply existing that it has stagnated in a constant cycle of burning through as much energy as it takes in. However if a grower is able to grow fast enough or is powerful enough they can exceed the resistance of Eldritch and its power. Eldritch DOES has a barrier, however it is barely existant thanks to it having most energy absorbed from it. The Eldritch barrier is more like a thin veil being brushed aside to gain entry into the plane of non-existence.

Non-Existence:

As the name suggest it is a plane of non-existence. There is no energy or matter within it, and what energy it does manage to create is absorbed by Eldritch as quickly as it is produced. There is simply nothing within the entire massive area of non-existence. It's barrier however is certainly the strongest of all barriers. A large percentage of growers may never even meet this barrier, and many that do often times do not have the strength to break through it.

There are of course many growers that can break through this barrier, which in turn results in a curious energetic reaction. This reaction is in many ways similar to the splitting of an atom, however since there is a powerful force growing through it it greatly lessens the energy produced. Where splitting an atom results in an obvious atomic reaction this reaction is buffered by the mass that caused it to happen in the first place. In turn the reaction is a tiny fraction of a percent lesser than it would be, meaning that the grower will likely not experience the full effects of what would otherwise be a powerful atomic explosion.

PRIME PLANE:

The Prime Plane is a curious realm of many planes. Some people theorize that within every atom is an entire universe, that is not far from the truth. Within every Prime Plane there exists everything from subatomic particles, cells, life, planets, solar systems, galaxies, universes, multiverses, megaverses, gigaverses, zetaverses, teraverse, metaverses, colossiverses, omegaverses, clouds of existence, a fabric of time and space, infinity plane, void plane, infinivoid plane, Eldritch and even Non-Existence.

Once you get through all those Prime Planes you reach another Prime Plane.
After 1,000 Prime Planes the matter and energy of the next Prime becomes distinctly different. Different enough that it becomes a new series of Prime Planes, A-Primes to be specific.
After 1,000 A-Primes comes B-Primes, then C-Primes and all the way to Z-Prime1-1,000.

What is after Z-Prime1,000? Well that is for a grower to experience if they are able to reach it.

Note, I marked this as fantasy, because the joys of fantasy are that anything is possible.
Yes I am using this to gauge the size of huge hyper things, so what? =P