Well, at least they don’t have to worry about the Gentlemen flying around town slicing pony’s hearts out.

@Ciaran  

 
…oh, someone’s clever. Well played. Well played indeed.

@DragonBoi471  
Dieffenbachia.
 
It can be toxic to horses because it has calcium oxalate crystals in its sap and leaves.
 
But that’s real world, not Equestria.

Two questions:  

@Background Pony #CBA7  

 
“It doesn’t matter, it’s moss or lunch. Just eat it!”

@CORDZ2000
 
Cheese Sandwich: Just eat it! Eat it! Eat it! Eat it! Open up your mouth and feed it!

@Background Pony #1C3F  

 
Good point

I’m calling it now. They’re going to fix the problem by eating it. That’s always how you solve the problem of too much muffuleta. It’s a real word. Look it up.
 
Incidentally, it’s a cute pun on multiple levels. It’s a moss that muffles.

Where’s a parasprite horde when you REALLY, REALLY need one?

@WyrmSpawN  
Except it probably multiplies faster than most non-magical plants which is how it’s overrunning Canterlot.

 
ITS ALL THEIR FAULT

When you think you’ve seen everything Equestria / Equus can show, something new always comes up. A moss plant that can absorb sound waves is undeniably interesting - and may have come from the caves that we know Cheese and Pinkie had visited. The ponies are admittedly herbivores, but moss is not exactly easy to graze on - and this only happens when there are no other food sources, moreover, this is intended for more hardy animals such as goats. They can not exactly burn up the moss when it sticks to flammable materials such as inside a house.
 
So I can understand why Twilight panicked - there are no quick and easy solutions to this problem, and the royal sisters are on their way to Canterlot who are now experiencing the same thing as Ponyville - thrown into chaos. If the moss plant can assimilate sound waves, then they should work in this field. Maybe Pinkie has the solution?

@Background Pony #CA70  
It’s not like they’re unable to speak but rather something is preventing them from speaking. But it could….

You think Autumn Blaze’s cure for the Stream of Silence would be useful here?

@Background Pony #1C3F  
They’re not savages.

This is gonna be the most quiet book/episode ever

@Macaroni C-Pony  
What’s it called? An Adamantoise?

@Digital Seapony  
Tbf, this whole page could be used as meme material for weed.

@Wolfram-And-Hart  
That’s what came to my mind as well! Also, your username is fitting.

If this was an episode of the show, we may had thought that someone hit the mute button

@Digital Seapony  
Indeed they do :)

This seems like a problem that could be solved by an angry kirin.

The bottom two panels look like they could make a good meme template.

Just a thought, but your population consists of sentient herbivores and your enemy is a plant, which you have not said is poisonous, magical or even bad tasting. Eat it.

Okay, hear me out?
 
Remember that Turtle from “between Dark and Dawn?”