A blocker card is a card of a different suit placed in the position of the wildlife you do not wish to attract.
In your case the 5th Gardener spotted would be from anything other than comfits to obtain a card of a different suit, and you would place that in the position of the Dodo and leave it there. In my case, I have the blocker card on my far right to stop anything coming through in the position of the Mouse.
You will then have your other two active diamond cards in the position of the Lory and Mouse and would only attract wildlife in those two positions.
Make sense? Hope so lol :D

That's exciting! I don't seem to ever spot anything at the moment!
I've attracted 12 of the Mouse now and decided to put out the blocker card to stop the other helpers coming to the garden to focus more on them. It's made it easier.

Haha I remember your 10s. So annoying!
I was getting all Aces for ages and needed high cards, then I needed and A, 2 and 3 for all 3 and didn't get one for ages.
On a good note - I finally spotted my first Lory and first Mouse today! Both in the same garden one after the other!
I was quite excited! Thought I was never going to spot any of them in this lifetime...

I have been searching for a 6, 7 or 8 for weeks and haven't even came close! If I get one more Jack.....

Haha I know! I don't know how they all ended up so out of whack with the timing!

There's all new food out in the other gardens now.
I'm struggling to find any of the Alice characters. I feel like they are SO hard to get!

Hello! The Mouse should be making an appearance now I have the 10 in place!

yes i am doing extreme pottery quest which requires me to attract 2 knaves, 2 queens, and 2 kings (of hearts)

are you doing Alice for the first time?
do you have the greenhouse?

I feel like this Alice thing will never end! I haven't spotted any of the characters I need, but am doing okay with attracting but geez... How are you going?