How do I work this?

[latewood]

As far as the hole saw, you can buy them all the way up to 8 inches I think. I just looked at a 6" one that was about $60. 3.75 inch seems a little small to me for holding a root mass securly, but it would probably be fine. I like 6 inch, and use the CNC at work to cut holes.

I started with 5" for the very reason you stated, but it doesn't give the plant much more if any more stability...I have found that if you grow trees...It takes more than a netpot to hold them up; And, after awhile I just feel that big netpots are a waste of hydroton.

I still use 5" for mothers and in DWC because I have so many 5" tops. If I knew what i knew now though...I would go completly with the 3.75...

I just wanted to add this. In the end. It works either way.