As I understand it, cycads like the root space (palms are more tolerant and even prefer a more snug-fitting pot). I would pot them up in a larger size but would be sure to a very well-draining soil..., also will help you in making them lighter in weight. I like to use a generous amount of orchid bark and perlite.

I was going to bring my own outdoors today but got involved in yard clean up. Are yours out for the season or temporarily? Over the years, I have learned not to rush it too much as mine are getting too big to move yet again once outside.

Appreciate your advice, Subtropix. Mine are out temporarily. Back in unheated but windowed outbuilding until warmer nights.

Even though I do not suggest it, you may be alright for a while. I have seen a picture of a 1000 year old Dioon edule sitting on top of solid rock in mexico. I know when I got my 400 year old plant, it was growing in 8 inches of soil and under that was solid limestone. It had been in that location for 70 years and looked great. I'd just pull one out and see how bad the soil compaction is. You can always just put them in pods that are just 2-3 inches bigger and that will give you another few years. Those bigger ones would normally be in 25 or 30 gallon containers by now if they were in a nursery.

They are some really nice & healthy looking sagos.I would not mess with them yet.How cold does it get on average where you are?Do you get alot of snow?The reason I ask,king sagos can take temps down to 19°F with no damage.They are native of Japan.

Your comments are appreciated, plantsman56 and scretsquirrel007. Agree it's time to find larger pots (thanks for the volume guidance). Looking for lighter plastic if available. Here in Nashville can be too cold (brief lows of 4 to 10 F) to winter in the ground. But as you say, sagos are tough survivors. First became interested in sagos after seeing a giant ancient one in a NYBotanical Garden greenhouse. It was (is) in a huge container.

Here is my 400 year old Dioon that was growing in 8 inches of soil

Hey plantsman how do you know it is 400 years old?I know it is old by size.But that is just a educated guess?

Cycads have a reputation for being extremely slow growing so therefore tall ones are then said to be centuries old. They are fairly slow but not that slow, although growth speed can vary between species. I have a Cycas xipholepis that about 10 years ago was a below ground caudex with fronds emerging, and today has a caudex rising over a metre above the ground. Faster than my other Cycas species.

It is just a guess, but a fairly educated guess. You can't see it in the picture, but the oldest stem in the cluster is the one I am under. It is 6 1\2 feet long. People say these grow one foot every 100 years in habitat. This, and others along with this one were brought into Miami in 1933. It was for a man's landscape who owned two properties a mile apart. He founded Fairchild Gardens and was his northern property. This one and the female, which is about 20 feet away were both at his home. If you look at the leafbases on this stem, you can tell which ones are habitat and which ones have been produced since 1933 because of there size and density. There is about 4 feet of habitat leafbases, and 2 1\2 feet of cultivation looking leafbases. So it is possible this one is 480 years old +-, so I just give it a little leeway and say 400. I have been to most of the botanical gardens in the US that have cycads, and seen pictures, and talked to people who have been to all the major gardens in the world, and unless there is some obscure garden in Mexico that none of the cycad experts have been to, only Fairchild and Montgomery have a Dioon edule this large. I am honered to be able to look at these every day and I breed them almost every year, as Nel would have wanted me to do.