I'm not sure if we ever figured out the breeding mechanics in NL, but from what I remember, in NL, you only have a set number of flowers spawning per day (I think basic random flower spawns in your town also add to that? I don't remember). So watering your flowers makes it more likely that those set spawns are from bred/watered flowers. So you'll generally have at least one new hybrid a day, but the amount is capped (and I'm not sure what the rates are in the end). In NH, you don't have a max spawn rate; instead it's just an increasing rate that a flower will breed/clone, so the flowers you get per day tend to vary wildly. You can go a few days not getting any results, but then you'll have a day when you get an absurd amount. So it definitely feels discouraging the first few days of watering a new plot. You get a kind of exponential effect where it's slow to start, but it can snowball faster, whereas NL feels more consistent even if you don't get the same highs.
You might already know this, but make sure you're not digging up your cloning patches. Digging flowers up resets their "bad luck mitigation counter." It's best to set aside a plot of land permanently for breeding/cloning, then leaving them there for a long time. Also a weird thing, but make sure you're actually watering your flowers (bear with me here). I'm sure you've had moments where you accidentally dig up a flower by accident/dig a random hole in a tile you weren't aiming for/etc. because you're slightly misaligned on the grid. I realized that when I'm watering flowers, I sometimes think that I'm lined up perfectly, but the game is like, "Nope! You're not actually facing those flowers!" and waters the wrong tiles. I pretty much always water flowers while walking south, because when walking any other way, it's hard to tell if you're actually facing the flowers or not.
Best of luck!
My Nook's Cranny always sells Windflowers, so feel free to PM me if you don't want to wait for Leif. : D