This was printed (in their newsletter and on GoComics) with the answer key attached and inverted. Here we’ve snipped it off and held it back, to be posted as a comment after people have had a day to provide guesses or reasonings.
Quiz from Wrong Hands
Comics I Don't Understand 
I’d say Sneezewort, Butcher’s Broom and Lambsquarters would be plants. Maybe Candytuft.
beckoningChasm is surely right about sneezewort being a plant, as wort on its own was a word for plants. (Which I learned about when there was a fad for St. John’s Wort as a otc supplement.)
My guess without looking anything up: P, P, S, S, S, P, S, P, S, S
Then I looked it up. 90% isn’t so bad.
Chemgal’s guesses are the same as mine.
Just FYI (no need to use this) the format of the answer section of the cartoon is
PLANT: Name, Name, Name, Name, Name
SLANG: Name, Name, Name, Name, Name
and the Names in each line follow the order they come up in the quiz, down the left then down the right.
And in that format, Chemgal’s answer (and Powers’s agreement) would be like:
PLANT: Sneezewort, Lambsquarters, Candytuft, Butcher's Broom,SLANG: Doddypol, Sticky willy, Bedswerver, Barbermonger, Driggle-draggle, Kickie-wickie
(let us know if I got that wrong).
And beckoningChasm’s partial would be:
PLANT: Sneezewort, Lambsquarters, maybe Candytuft, Butcher's BroomAnd no, that isn’t the most convenient format. But it will make comparison and scoring easier when the already-formatted answer image is published. Probably more convenient would be to sort of follow the layout of the puzzle:
If you wish to use that “Format 2”, you could copy the following, paste into your comment form, and edit any “P or S” to give your answer for that item.
Sometime tomorrow, when we post Wrong Hands’s answer key (as image using “format 1”) we will also post the answer key in this “format 2” layout — for easier “scoring” depending on what you use.
Again, neither format is required, nor does using one of them mean you have to commit to answers on all 10 items.
The </pre> tag should keep the spacing so things line up vertically (as they may do here, depending on how you are viewing it).
My guess
Sneezewort P
Lambsquarters P
Doddypol S
Sticky Willy P
Bedswerver S
Candytuft P
Barbermonger S
Butcher’s Broom P
Driggle-draggle S
Kickie-wickie S
The sneezewort must be a plant, as already remarked, since it has the -wort root.
A -pol[l] is your head, so the doddypol is a slang insult for someone who keeops drifting out of the conversation or even falling asleep.
The sticky willy, say no more, nudge nudge wink wink.
The candytuft would seem to have tufts, which might be the fluff parts some plants do have.
A barbermonger would be a chap who keeps trying to “sell” you on patronizing his barber or haberdasher or hack, and you suspect gets some handback for this. Still done in the 21st Century, if you’ve ever seen those forms to recommend a company to a friend and get a payback if they buy something. You’ve seen those?
Butcher’s Broom I may have seen before, but in any case Broom seems definitely plant life.
I knew some of these and was not sure about others; as an old Elizabethan Drama major in grad school, I was afraid to take the test lest I depress myself with how badly I might do. But one that I was dead sure on was Doddypoll, since it’s even in the title of a play of the period (give or take a consonant):
https://en.wikipedia.org/wiki/The_Wisdom_of_Doctor_Dodypoll
I must have read it back in the day (circa 1970, but have no memory of doing so).
I know lambsquarter is a plant, as it is edible and was in the Boy Scout handbook or something. A wort almost certainly is. Sticky Willy I think is that plant with the barbed stems that produces tiny burrs. I’d guess Butchers Broom and candytuft are plants also. The rest I’ll say are slang.
Keep your sticky willy to yourself!
And it’s Wednesday morning!
Herewith the answer key part of the original comic image, cropped off and inverted to be readable:
The answer key in “format 2” :
I hadn’t thought about going thru the responses to score the entries and congratulate the winners on their correct or near-correct slates. Any volunteer for that job? Meanwhile, thanks to all who participated, and those who shared their thinking or historical etymological knowledge, whether or not they submitted a full slate. And, erm, @Deety: don’t think your “Plang” answer went unnoticed!
100% for me. Yay.
Any ideas what those slang words were referring to?
Good work Brian.
Ha. I was right about the sticky willy, it’s that barbed stuff. I had it growing in my semi-wild backyard at one point.
https://en.wikipedia.org/wiki/Galium_aparine
Having read this strip after the answers were posted, I will not cheat and enter.
[…] For a similar post in the past, we withheld the answer key and then posted it as a comment within the thread after enough answers had been posted. Here I think we can try the honor system: the answer key will be here, but obscured in a slider. You can leave it closed, then check after you comment; or skip commenting and just have a look after satisfying yourself that you know what it will be. (Slide up to see answers.) […]