I’m actually in this demographic.
If I’m looking for information on plants, I’m not looking for a clean trendy, modern, hipster logo website. For me, growing plants is all about dirt and green and environmentally pleasing. Maybe not black oil slicks on waves. I want something that looks like it knows what it’s talking about. And quite honestly, this kind of website, the logo isn’t going to sway me as much as the first couple of posts I read. But it would help if the logo were sincere.
I guess now that I know your focus a little better, I have to ask why the focus on wave and surf rather than green and plants? The color black also has a weird connotation in gardening relating to “black thumb” so either it’s about killing plants, or maybe where someone would look to get information to avoid killing them, but the second is a stretch.
Or maybe this is a hydroponics website? Then you might have hit your target with the top one.
You can go all trendy and modern and maybe appeal to the people who mist their gift orchid til it dies, or you can appeal to people who actually grow things. If this is not aimed at the trade, but more toward hobbyists, you might want to rethink. Take a look at sites like Dave’s Garden or GrowVeg.
(Those are just two sites I use and DG has grown beyond the capability of their webmaster and is quite a mess now. But usable.)