Probably a silly question,  but im using a Bouquet in the hope of reducing dragons,  as I want to attract Pegasus for my quest.  A Pegasus isn't a Dragon is it? Lol.
Thanks .

Good question!  I wouldn't have thought it would count as a dragon, but you never know!  It does specify "dragons" rather than myths so maybe you'll be ok.

Thanks , ill see how it goes, at the moment I don't have enough space for 2 bouquets. 

Having 2 bouquets wouldn't help.  We get that 30% rate no matter how many bouquets are in the garden.

Is that confirmed? Like written in some official place?

It’s confirmed.  From Mike:

  …..Hopefully you notice the effect when using it - an approx 30% reduction in WRC/dragons etc is about the most I think it's reasonable for it to do. Any more than that would spoil the game, giving too much of an advantage and making challenges too easy.
  Post by Fairyland Developer

Kathy: he’s put WRC/Dragons etc.  Do you think the etc refers to other myths like Pegasus?

Someone shared a response she got from support:

"The “designed bouquet” improves mushroom effectiveness by reducing the “side effect” wildlife they attract by 30% (WRCs, myths.) It’s a subtle but noticeable effect, and it’s almost always beneficial to include it whenever you have space available. The exception would be the small number of more advanced setups which already require all 9 garden spaces.

Regards,
Fairyland Support"

Here they state "WRCs and MYTHS"

.... sooo maybe it is all myths and dragons... so do not put a vase in your garden when trying to attract myths or dragons 😊
She said they did not mention mice or mallards.

Mice and mallards aren't included.