If you came to visit us, you might wonder why we have old hollyhock stalks still standing in our garden. I know my husband does! 🙂
If you look very closely, you might find a clue.
The hole is a sign that something is living inside. When we opened one of the stalks recently we found:
The pithy center of the stalk had been hollowed out and a small carpenter bee had made cells for her offspring.
The bee would have started by creating a cavity. She would prepare a small ball of bee bread, a mixture of pollen and nectar. When the bee bread was ready, she would lay an egg on it and close the end with a plug of plant material. (It looks like sawdust here). Then she would make some more bee bread and repeat the process until the cavity was full. Within each cell, a larva would hatch from the egg, eat the bee bread, pupate and then become an adult bee. Eventually the new bees emerge from their chambers.
The adult small carpenter bee ( Genus Ceratina) is dark blue, greenish or black. It is much smaller than the regular carpenter bee, hence the name.
You might wonder if the tunneling by the bee harms the plant. It turns out that the living part of the plant is in the outside tissue that is not disturbed. Because a hollow tube is very nearly as strong as a solid one, the stalks are no more likely to break. Bees, like small carpenter bees, are important pollinators and should be encouraged whenever possible.
Did you know that honey bees aren't native to the Americas? The honey bee came to North America with the Europeans. The continent wasn't lacking in bees before honey bees came, however, because a vast assortment of native bees were already happily pollinating flowers.
Like these busy native bees working our sunflowers.
The pint-sized pollinators have been coming in a constant stream since the sunflowers opened.
They leave each flower with yellow pollen-laden legs loaded to overcapacity . How do they even fly?
Thanks to these bees we have a heavy crop of sunflower seeds. Go, bees, go!
Although the weather is uncomfortably hot for humans, things are still happening out in the garden here in Arizona.
The sunflowers we planted for the Great Sunflower Project have started to flower.
The bees can hardly wait.
A few days ago these bees were sleeping on a nearby milkweed plant.
Long-horned bees (tribe Eucerini in the family Apidae) are named for the long antennae present on males. They have a habit of clustering in groups to sleep overnight on plants.
I'm not sure what species these particular bees are. There are over 30 genera in the tribe Eucerini, including Melissodes (the long-horned bees), Peponapis and Xenoglossa (squash bees), and Svastra (sunflower bees).
Hopefully we'll be seeing bees on the sunflowers soon.