This summer has been kind of a bummer for marijuana stocks, with investors hopping on to more exciting, dynamic, and -- let's be honest here -- more profitable sectors in the hopes of making a buck. 

But we should never count a good pot stock out. In this Motley Fool Live video segment recorded on July 16, veteran Fool contributor Eric Volkman and healthcare and cannabis bureau chief Corinne Cardina point out that ever-volatile Sundial Growers (SNDL -2.93%) was up 72% as of that air date. But there are three other names outperforming the broader market that investors should keep an eye on.

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Corinne Cardina: So if we do look at the pot stocks as a whole, are there any that have either outperformed the broader market or even just outperformed the pot industry? Any standout or breakaway stocks to keep an eye on?

Eric Volkman: Well, honestly, there's not a lot that have outperformed the market. If we use the S&P 500 [index] as our traditional benchmark, we really only have a handful.

The biggest one is, I would characterize it as a wildly volatile meme stock, that Sundial Growers, that's up 72%. That's not really due to any fundamental factor. It's because it's a meme stock. Depending on what people are writing about it in places like WallStreetBets, that tends to move the share price more than anything else. But that's all over the place. It's really volatile. If you zoom out to one year, those shares have traded from $0.14 apiece to almost $4. That's a pretty queasy roller coaster ride. That would spook me for a lot of reasons.

Also, retailers have been doing relatively well. If there is a popular class of pot stocks right now, it would be the retailers. We have some being quite successful over the past few months.

Year-to-date, for example, Green Thumb Industries (GTBIF -3.20%), they seem to be leading the retailers. They're up 27%. So far this year, the S&P 500 has gone up 16%. Other retail-focused companies, we're looking at Curaleaf (CURLF -6.05%), we're looking at Trulieve (TCNNF -6.41%), they're almost beaters at 14%. Not quite there, but sort of, kind of marching along with the S&P 500.

Most of the other pot stocks, particularly the Canadian ones, particularly the very sprawling and vertically integrated ones, they haven't done well at all. A lot of them are negative territory.