I haven't seen the plant ad, but it sounds like once you start learning about how the ad industry works your mind will be blown. Insane amounts of money have been poured into research by the industry (including some highly questionable research being done on children and infants) and some of the results are fascinating.

The manipulation goes beyond even the content of the ads themselves. For example, one of the reasons companies are spending so much money collecting/buying/storing/securing every scrap of data they can get about you and your life is so that they can target ads at you at specific times when they know you'll be more vulnerable such as times when they know you'd normally be tired, or when they think your medication may be wearing off, or during periods where you're under high stress, or when you might be entering a manic phase, or when you're intoxicated, etc.

Like I said, understanding the many many ways that you are vulnerable to their tricks can help but it won't stop them from working on you. It's kind of like how you can't not see certain optical illusions even though you know you're interpreting them incorrectly. The conclusion I've come to is that it's best to do everything you can to avoid exposure to advertising where possible and to keep an eye out for when those tricks are being used against you elsewhere.