<SPOILERS?>
Thanks so much for the input. My game went south so I started over a couple times since I weighed in. I still think there may be something to the sunlight streaming in from the left on some of the second and third row plants. My thought was that if a plant was pollinating, sitting it in the sun would "bless" it with an extra seed or something. I haven't noticed any clear patterns or tried to prove this by paying that close of attention. But it does seem like a nice idea and one time a pollinated plant gave a fifth seed for no apparent reason.
When I started over, I got a magic plant right out of the chute. I self pollinated all the ordinary plants, saved one seed of each, and have them in storage, then sold all those plants. Then I started self pollinating the magic seeds and getting whole beds of it to self pollinate and sell, and selling it for 50 bucks a pop. I haven't tried to go higher but they are selling well at that price. My strategy before getting into any cross-pollinations is to keep working with the magic plant until I have enough to completely upgrade the nursery and all my soils and waters and shears. Then I will start looking into finding all the other magic plants. It does seem to be a good idea, don't know if it matters, to cross pollinate same species of that first magic plant so the plant stays healthy through different generations.