Mark, Thats a tough one. There are many insects that provide pollination for our home gardens. I think the 30% reference is because of migratory beekeepers providing pollination for hundreds of acres of single crop production. In other words the California almond production would not be possible on a large scale without bringing in bees. As far as my home garden, I always see honeybees in the blooms along with other native bees. I have 5 hives in my backyard, but I would assume on a small scale, with or without the honeybees, my garden would do well. I think as the scale of your food production increases, the honey bees play a more important role in supplementing the native pollinators.