i did a lot of cross pollinating, but I didn't always get more expensive plants, sometimes the result was a measley $12.00, I think I figured out some of the underlying logic, but I'm waiting for the windows version to test it out properly as I found too much dragging the stylus across the screen on my ipaq was leaving marks,
-Note to developers, if you ever bring out any more games for pocket pc -move seeds/pollen/water/food/soil without the stylus or make it possible to click on where you want to move, I hate scatched screens!