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Although you may be heartily sick of reading about bee nests after my firewood bee nest post and my post about "small bee towns", I was still gungho and wanted to try another technique.  Stem bundles are probably the easiest type of bee nest you can build, and they may be more effective than my wood block nests since the insides of hollow stems are naturally smooth and conducive to bees.

To make a bamboo stem bundle, cut bamboo into sections just below the node so that each piece has one long tube that's naturally blocked off at the bottom.  If you don't have bamboo, you can use hollow-stemed weeds as long as you find a way to plug the far end --- I'm trying a bit of mud and ashes, as you can see in the photo below.

As with wooden blocks, you'll need to decide whether you want to combine just a few stems together for a no-maintenance stem bundle or make larger nests that will need some care.  If you choose the latter, you can make a very pretty stem bundle by stuffing cut stems into coffee cans, plastic buckets, or short pieces of PVC pipe.  With just a few stems, though, it's simpler to tie the twigs together with a piece of wire or string.

If you don't have any bamboo or hollow weeds on hand, you can drill out the centers of pithy twigs to get the same effect.  Elderberry, sumac, and chinaberry twigs are supposed to work well --- I'm trying elderberry.

I hung one stem bundle on the side of our wood stove addition on the south face of the trailer and another under a limb in the kitchen peach tree.  Now I just need to wait and see which, if any, of my artificial nests catch the fancy of our wild bees this spring and summer.