I'll go for genus Crassula.

@Christopher CNC I am not saying no to that, but I could not locate any Crassula species that grows like a bush with a woody stem.

"I could not locate any Crassula species that grows like a bush with a woody stem."

Common jade plant, Crassula ovata, is the most common of that genus to produce a large, shrubby mass. When gown in suitable climates, it can reach as much as 8 feet in height and with stems 2 1/2 inches in diameter.

A fair number of other crassula species can form small woody stemmed shrubs as well. It is just that most consider and grow these as houseplants rather than permanent landscape additions and thus they never get that large.

I agree with S G

@s g I am warming up to Aeonium haworthii. The attached reference photo from Debra Lee Baldwin looks like a great match. Other reference photos on the Internet seem to have thinner leaves.

References online say the plant does not grow wider than two feet, but I have news for them.

@gardengal48 (PNW Z8/9) Good point that many larger succulents get size-limited by their use in containers. If you look at the leaves on my plant, it is definitely not a jade.

I want to transplant this established plant into a gigantic container. Does anyone have an opinion on how likely the plant is to survive a transplant done in Winter? How deep is the root structure on this monster likely to go?

The strong rosette of leaves on the branch tips does say Aeonium more than Crassula.

Let me be clear :-) I did not say the plant in question was a crassula........I only wanted to point out that many of that genus DO have the ability to develop into large, woody stemmed shrubs.

I agree it looks to be the aeonium previously ID'd.

I understood that. It was the shrubby nature that made me think Crassula. I don't know Aeonium in practice and the ones I see online are generally larger leaved and single to few stems, not the multi-stemmed mass of this plant.

I want to transplant this established plant into a gigantic container.

The stems on these can be a bit brittle. Do you have a plan for removal from the ground that would not tip the plant on a side? If the form is what is behind the desire to pot it as a specimen, then you will want to minimize breakage or be willing to wait for any resulting gaps to fill in with new growth.

@gyr_falcon There are several reasons for a transplant:

1) The sitting bench for the garden faces this plant on the shade side. The shade side is just bare twigs and is ugly. The proposed planting in the pot will leave the rosettes in the sun, as well as having the rosettes visible to the seating area.

2) The "Aeonium bush" has become too enormous for the small patch of garden it occupies.

3) The pot is huge and will get the Aeoniums elevated, which I think will make quite an impact.

4) It is going to cover up a hole in a hedge line.

I don't really have a plan. The main problem is I have no idea on what the root system will look like. How deep will it go? How wide will it be? There are drip irrigation lines buried all around this thing, so it will be surgery to get it out. I guess the best strategy would be to lay it back on its shaded twig side and not put weight on the rosettes?

If it is the same one as I have, it is tolerant of poor soil (it is in a clay soil outside) so don't worry too much about the potting mix composition. Mine has survived neglect for more than 20 years.

The stems are tough. I use secateurs to cut them back as the stems are woody. It tends to have extensive roots but simply cut them back to the size of your pot and it should be fine. Just let the soil dry out after repotting to allow the roots to heal before rewatering.

It ought to be possible to keep it upright after you have dug out the roots and lift it up into the pot by gripping the woody stems close to the roots. You may need another person to help lift it with so much foliage to handle. Even if some rosettes are damaged, they grow back quickly.

@s g are the roots deep or wide?

I will bare root this and let it dry out before it goes into a container mix.

Sorry, I cannot help you with the root system's size. I tend to take cuttings and start new plants rather than move existing Aeoniums, and I cannot recall having removed one of that size.

I can only comment regarding the times I have pulled some of the plants out when they started to propagate where they weren't wanted. The roots tended to be shallow overall, not deep like a taproot.

This is half my plant, the rest is to the right of this. It is about 3 foot high.