So we've noticed how the royal sisters' manes seem to flow forever.

Yes?

Their hair flows all the time. Cadence's doesn't. And neither does Twilight's.

Now before I move on, I have to point out that since their manes flow like they do, I always expected them to be kinda water-like. Like, if I were to run my hand through Luna's mane, I would expect to pull it out and it would be all wet. Which would probably make bathing for them kinda awkward.

Tia: Luna!! Can you get me a towel!

Luna: Sure thing sis!

"Thanks!"

*a few seconds later..*

"Luna!! Can you bring me another towel?"

"Fair sister, we have already bro't to thee a towel. Thou require another?"

"Yes."

*a few more seconds later*

"Luuuunaaaaa...I need another towel!"

*Luna opens the door* "What could you possibly be doing in---Mother of God..."

There is a mound of soaking wet towels on the floor and Celestia, in tears of terror and confusion, is vigorously rubbing the towel through her hair trying to dry it

"I don't know what's happening Luna!! Make it stoooooooop!!!"

"Hold on, Celestia! I'll call somepony!!"

The rest is open to interpretation lol

So anyway, since I always thought that their hair was liquid-like, it felt kinda weird to see Pip pull on her hair. It's freaking adorable but also kinda weird. I expected there to be a splash of some kind

Anyway, back to what I was saying (now that the rabbit has been chased)

I think it's because there is a special shampoo that only the royal sisters have access to. To have the flowey hair doesn't require one to be a princess. You just need their shampoo.

This is possible. Remember when Luna was no longer Nightmare Moon? How her hair was...normal? She hadn't had the royal flowing shampoo in 1,000 years. And Nightmare Moon's hair flowed because it was powered by evil nightmare magic. The next time we saw Luna, she had flowing hair. Chances are she took a bath between her transformation and Luna Eclipsed.

Now, you might ask, "Where does one find this shampoo? From what would it be made?" A very astute question, young student!

Have you ever read "Rainbow Factory?"

Rainbow is just another term for shampoo in Equestria. Rainbow Dash? Yeah, she's also called Shampoo Dash. She's the mascot for Head & Shoulders. It's her second job. She's gotta be able to pay for all that Daring Do merch somehow and, let's face it, being a weather pony doesn't pay well.

Now regular shampoo doesn't have the magical ability to make a pony's hair flow like the shampoo from Rainbow Factory. They have to grind fillies and colts up to make it because they're magical. And only ground up fillies and colts can make special hair flowey shampoo.

I kid, of course...

But now that I think of it...what if Rainbow Dash got a hold of their shampoo...?

Anyway, I feel like this sums up today's blog entry quite nicely.