My father grew neem in the caribbean.
I'm crazy for neem on an island of mesquie and thorny acasia.
They grow tall and willowy so you will need to support them for a couple of years.
I would strip the leaves from a couple trees to fill a blender. Them make a fine leaf water to shower with.
Four years later i still don't like using soap.
A friend used the water to wash the ticks and fleas off of her dogs.
My high desert arizona property is under eight inches of snow right now.
I so wish neem could grow there.
You can get tons of information from :"neem tree farms"
They will tell you that starting neem from seed is tough.
My father let his girlfriend be his executor. If i ever get my inheritance there will be two acres of neem in the middle of bonaire, dutch caribbean.