Re: Mapping software for bee plants?
I would use qGIS primarily. It is awkward to get up and running with but, as in beekeeping, a mentor can make life relatively easy. If I am understanding your objectives correctly, that would include being able to not only locate various plant species such as, perhaps, your apple trees, but also being able to derive the areas of various types or combinations of plants. This is very easy to do with qGIS. It will also give you a Google Earth view, which is helpful for plotting or checking features. qGIS will take data in a variety of formats including GPX, delimited text files, KML, ESRI shapefiles and so on. It will also facilitate georeferencing raster files such as aerial photos. One fo the features that may be helpful to you is that qGIS can very easily produce clickable HTML maps, which makes it easy to distribute your plan.
Hardiness Zone 5a. Planning for first bees to arrive in Spring 2014.