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Pollen Nation - Supporting Pollinators
We owe thanks to our pollinators for giving us food to eat and seeds to grow. Bees, birds, bats, moths, flies and butterflies gather protein-rich pollen and sugary nectar from flower to flower while cross-pollinating our food crops and almost every plant we see (except of course those dependent on wind pollination.)
Yet many of our pollinator species are threatened, endangered or extinct from widespread chemical use on farms and gardens, genetically modified crops, and loss of habitat due to development. Bees are considered a “keystone” species, meaning that many other species depend on them for survival. Their extinction means our extinction. So why do we continue to harm them while at the same time demanding so much?
We can begin to help our pollinators by incorporating native plants back into our landscape and creating forage in places where it’s lacking. We can make our gardens a natural habitat for insects rather than a toxic place that only exists for our enjoyment. It’s a critical time to create gardens that mimic the native environment and help our suburbias (and farms!) be a little more natural. Below, we highlight some ways to encourage pollinators to come onto the scene and some of the plants that attract them.
Over millions of years, plants and pollinating insects have evolved together. Certain pollinators favor certain flowers depending on which colors they can see or which shapes their mouthparts fit into. Below we’ve outlined some patterns, but bear in mind it’s only a rough guide—pollinators are not always picky and tend to jump around. Every visit to the garden is an opportunity to observe pollinator habits.
Nectar-rich flowers attract butterflies, which typically don’t gather pollen, but extract nectar with long proboscises.
The nectar of red tubular (trumpet-shaped) flowers attract hummingbirds, which see red and have long narrow beaks that fit perfectly into deep flowers.
Umbelliferous (umbrella-shaped) flowers attract beneficial insects such as parasitic wasps and syrphid flies that have small mouthparts that fit perfectly in the tiny little flowers. Not only are these insects good pollinators but also the best ecological pest management around!
Purple and blue flowers are often pollinated by bees, which see the ultraviolet end of the spectrum.
Composite (daisy-shaped) flowers attract many kinds of bees and also provide a sheltered sleeping place for male bumblebees, which don’t return to the nest. At dusk or early morning they can be found tucked under the petals, sleeping soundly upside down.
Host Plants for Butterfly and Moth Larvae
Native Pollinators for the Orchard
Most native bees are solitary dwellers, unlike the social honeybee. They have single nests in holes in wood or in the ground. Two of the best species for pollinating tree fruits are the blue orchard mason bee and the leafcutter bee. One way to encourage native bees is by growing plants that provide early-season forage, like willows, dogwoods, amelanchiers and viburnums. You can also invite bees to the garden or orchard by building simple nest boxes.
Building a wooden block nest box for solitary native bees
Grab a random piece of untreated wood, 4x6'' or so and at least 6'' deep. Drill several holes of different sizes. Smaller bees nest in 3/32–1/4" diameter holes, 3–5'' deep; larger bees need 1/4–3/8'' diameter holes, 5–6'' deep. Holes should be drilled 3/4'' apart and this same distance from the edges. Choose your length. Bees will not nest in holes that have both ends open, so tack a board on the back if holes punch through. They do not like rough holes so make the sides of the holes smooth by using a sharp bit. If you really want to get fancy, you can throw a roof on to help keep off the rain. Mount block nest on a post or attach to a tree trunk near the orchard or garden. Discard nest boxes every few years so they don’t build up with parasites or diseases.
Ready-made nest boxes are available from the OGS section of the Fedco Seeds catalog.
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