Is 1 buzzy bee enough or more the better to get mutated crop?

[Astro]

Is 1 buzzy bee enough or more the better to get mutated crop?
I have 1 lv5 and 2 lv4, should I use all of them to increase mutation chances on my crop?

[Ilya]

Multiple bees won't stack, but the higher level bee will give a higher chance of mutation.

[Astro]

Thanks