Wizarding World Fauna and Potions for Muggles

[severusbook4]

No: HPFGUIDX 79558

I hope this has not been covered, but if it has, Sorry.  I started 
thinking about potions and their obvious effect that they have on 
magical people, would the effect be the same for a muggle?  And 
also, what about the plants?  Can you see a muggle trasping through 
a forest and finding a mimblintonia? <sp?> Prodding is odd exterior 
and being covered in ooze.  Or rather a mandrake and thinking it 
would be a nice addition to their garden?   We would see unconsious 
and dead muggles everywhere.  I guess the MOM would police these 
plants and make sure they are not growing wild where muggles could 
find them, but still, think of the possibilities.  Also, would a 
muggle be able to breath under water if they ingested gilly weed? Or 
experience any other magical property of WW plants?  Or is it the 
reccessive gene that makes one magical that also enables them to 
benefit from the magical properties of these plants?  Just some 
strange mental meanderings.

     One more thing, I know it has been discussed about creating 
something from nothing, but in GoF Molly is cooking dinner and she 
stirs an empty pot with her wand and a creamy substance (gravy?) 
pours from the end of her wand, I believe it was just after picking 
up one of the joke wands of the twins.  So this is not real?  It is 
just basically a placebo for gravy with no real nutritional value, 
just for taste?  It is the only reference to food being created from 
nothing in the books. 

Sevvie