I have one of my three gallon pindos in a 5 gallon pot. I Added miracle gro potting soil, but did add some sandy like soil for quicker draining. If they will spend their lives in pots miracle gro should be fine, but if you want to eventually put one in the ground, then you should probably add some sand because the clay that you have to deal with on the east coast will hold just about all the moisture that comes down during the winter. Im not sure if a pot will control their size, but I have mine in a small pot because I dont want to have a hard time taking it in in the winter, and it probably will reduce the growth a bit. I will probably keep my potted pindo out as long as nights stay above 25 because I want to see what it can handle.

Thanks tz7. I had a 5 gallon pot in mind for the same reason. I'd like to go ahead and plant them, but can't make a decision just yet b/c I don't want to crowd my windmills. I know these Pindos will get huge over time. Just came back from Destin where I saw a ton of monster Pindos. That's why I got the itch to go ahead and get a few, b/c I have been thinking about it for a while.

tz7,
Meant to mention that I bought these 2 Pindos from your recommended ebay source. They look great, just like the last 4 windmills I bought from him, and he beats any price I've seen. Thanks for the recommendation.

Glad the pindos you got from him were nice. I also got my philodendron, bottle palm, and windmill palms from him and they were all cheap, large, and healthy. I cant find anything locally for that price.