Hi, I live in Italy but have a lot of genista some cytissus. I can say by observing the genista spp that it is working as a pioneer species on my land and it makes sense being a nitrogen fixer and with that goes with being so.
i think I'll leave it where it is.
As a pioneer after its been included again in the woodland it keeps on growing even if less thick, and thrives under the oaks. I have it even close to some olive trees.
I think it could be a good companion in food forest projects. Nice color of flowers even and good flowering period is it good for bees? I don't know.
This is an image of a place close to my land where you can actually see what a pioneer plant does. the genista is growing out of the woodland occupying the abandoned field.