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Plant native plants: Native pollinators rely heavily on native plants for food. Will they visit and pollinate cultivated plants? Usually. But many non-native flowering plants, shrubs, and trees are bred to have big showy blooms at the expense of producing large amounts of pollen. Also, native pollinators don't always recognize the food value of cultivated plants, because they don't have an established history with them. Besides providing nectar and pollen-producing flowers, native plants also act as hosts for insect larva, and provide seeds for native birds.
For a list of native plants that grow in your area, visit the Xerces Society, an organization dedicated to the conservation of invertebrates. http://www.xerces.org/plant-lists/
Look in your local yellow pages or contact your county extension agency to find nurseries in your area that sell native plants.
Focus on diversity: Different flowers attract different pollinators. For example, some flowers have stripes or color variations on their petals that act like a landing strip and guide pollinators toward their nectar. Others have shapes that accommodate long beaks, or flower only at night. Different pollinators are equipped with different tools for collecting and transporting pollen, so growing a diverse group of plants--plants with different shapes, colors, sizes, fragrances, and flowering times-will attract the greatest number of native pollinators.
Provide water and shelter: Like all animals, pollinators need access to fresh water and places to feed and raise their young. Use a birdbath or shallow pool containing rocks to provide pollinators with fresh water. A quick Internet search will provide you with free plans for bird houses, bat houses, and nesting bungalows for native bees. Let a corner of the yard go to native grasses, weeds, and wildflowers to provide shelter for pollinating insects like ants, moths, and beetles, and a patch of bare sandy soil to accommodate underground bees. Locate these sites away from patio areas and places where children frequently play.
Avoid using chemicals: Pesticides and herbicides are a pollinator's worst enemy (and harmful to other beneficial insects as well). Garden organically and consider an integrated pest management system to control pests. If you do use pesticides, please apply them when they will be the least disruptive to pollinators (usually after dusk for insect pollinators).
Know your garden pollinators: It's important to know who your garden pollinators are so you can plant the type or flowers that attract them.
Several days ago, I found five really weird caterpillars on one of my small Meyer's lemon trees. They looked like truncated snakes with white and black stripes and patches that fell into a scale pattern and even false eyes. There was a kind of snake nosed hood that covered the actual caterpillar head and if you touched the hood gently with a grass blade, a red forked tongue feature would dart out. I tried to get the local extension agent to identify them for me, but they weren't familiar with them and advised me to kill them before they spread--especially since they were eating citrus. Late yesterday, the University of Florida Master Gardener got back to me and identified them as Orange Dog Caterpillars. They are the young of giant swallowtails that live on citrus. The interesting thing is that she said DON'T kill them.