There are several ways to make a traditional besom. Below is an article that explains one say. Farther below is a video that shows you another way. Enjoy! Have a wonderful harvest and Happy Halloween/Samhain.
From the Good Witch's Homestead:
I thought that this would be a good time to share with you all how to craft your own Witch’s Broom, known as a Besom.
Technically speaking, a broom is the flat ended sort of object that
we generally use for physical cleaning; while a Besom is a round shaped
bunch of straw (or other plant material) bundled around the center
handle, and is used to cleanse an area of negative energy, usually in
the preparation of ritual or magickal work.
While you can buy a besom, and there are many lovely ones to choose
from -it’s also pretty easy to make one of your own. The bonus of making
it yourself is the addition of your own energy tied to its creation.
Although the items that follow are for the more traditional style of
besom, you can use nearly any types of branches and plant materials
available to you. Even a wooden dowel from the Hardware Store can be
used.
click the link for the rest of the article
https://goodwitcheshomestead.com/2017/02/21/how-to-make-a-besom-plan-1/
Video by Michael Stibane: