Turned some a few years ago. The pieces I had dried without cracking. They were about 1 to 1 1/2 inch diameter, and I dried them for 6 months before turning. Turned really nice, wish I had some more of it.
Here's a knife and pen I did with Manzanita that I got from my brother in law. Unfortunately, both the knife and pen were destroyed during the Carr fire in Redding California where the Manzanita came from. My source for the wood was also destroyed as my brother in laws home and property were completely destroyed by fire.
I found the wood to be easy to shape and turn on both the knife and pen. And as an added bonus, I had no idea it would turn out as nice as it did. The wood was air dried for about a year before I used it. Good luck and I hope you have the same experience as I.
Here's a manzanita pen I made recently. The wood was dry/seasoned when I got it. It turned and took the CA finish well. It reminded me of oak. The lighter wood turned and sanded differently than the dark, if you have a piece like that.
There are laws in California about Manzanita - it may be illegal to cut it, have the wood in your possession, etc. It may require a permit, even if it is on your own property.
I tried to figure out what is legal and what is not legal to be more helpful in this post, but what I found on the internet is contradictory and confusing. Some species are very rare, endangered, and highly protected. I found other references to hybrid varieties and planting manzanita as ground cover. Like so many things on the internet, I could not find a trusted, authoritative source for reliable information about the law. All I know is that there are laws surrounding the harvesting, use, and possession of manzanita.
Be sure you know the law before you start using manzanita, especially in California. I am sorry that I could not be more specific.