It will be OK for a few years but ultimately it will outgrow the pot. You can either keep it pruned to an appropriate size or you could start looking for a larger container and somebody strong to help you move it! It will grow into a medium sized tree if you let it. I find that hollies in pots need to be carefully watered, they will drop leaves and berries if you let them dry out in summer, and can drop leaves if they get waterlogged in winter. Use a good tree/shrub compost that will keep some structure and ideally refresh the soil every few years.

'Jades are Crassula, and not cactus at all, All cacti are succulents. If you put a living plant in there is will need good drainage, air circulation,sun, some food at least once a year, just transplant it into fresh mix. with 10% organic matter, the rest inorganic, sand compacts and doesn't let the air in the mix, which is important. I think the lizard would love to eat it. My friends grows theirs in a open pen that they can't get out of in the open on the ground. They live in the high desert. They may bring them into the green house during the winter. Crassula need a cool evening. 90 F and 70F night time temps. as an example. your plant will also need a cool winter. No heat. Little if any summer moisture including high humidy. I've grown these plant since I was a child, and the plant that you are calling 'Agentea' does have the smallest leaves, yet is just a variety of C. Ovata. Some are bush some not depending on how you trim it. Leaves have noting to do with it, it's flowers, bark, nodes etc. Norma

there are 3 problems with overwintering in z5-6 .... the key is.. GET IT DORMANT>> AND KEEP IT DORMANT .... if you put them in a structure.. there is a chance they will come out of dormancy and start actively growing weeks or months before proper .... so that is problematic ... also.. they can get too dry ... its hard to water in winter in our zones ... if you do NOT protect them.. then you have issues of water build up in the pots.. and freezing the root mass solid ... and also.. winter sun on black pots ... can freeze/thaw the root mass too often ... all that said.. rather perfunctorily ... the best tempering device you have.. is mother earth .... she will hide the pot.. and she will provide water on those warmer days ... i dont really understand why you cant plant them now .... even.. as noted above.. if you just dig a hole.. and sink the pot and all in the veggie garden ... they can be moved and planted properly as soon as the soil thaws in spring .... IF YOUR SOIL HAS PROPER DRAINAGE... if you have horrible clay ... well .... figure out how not to sink it into a cauldron that does not drain ... if all else fails .... set them on the north side of a structure .... absolutely no sun .... let them go dormant .... and then around 1/1 ... lay them flat on the ground.. so that water can not accumulate in the pot ... to put a sharp end on it... just planting them.. 95% success rate healing them in ... with or w/o pot [no clay] .. 90% north side, tipped over .... 89% unheated structure .. in my experience .. 80% good luck ken

when you hang with a bunch of tree huggers.. there has to be one voice out in the wilderness ... and to be sure.. i wasted a lot of money and plants.. learning about proper spacing.. and ending up.. just having to suck it up.. and kill my mistakes.. and usually the prior owners mistakes .. get a good pair of hand shears .. i like felco's .... and see what you can do with it over the years ... just be sure.. soon enough.. you will get old and not want to be messing with it all the time ... and find that removal solves things ... and never forget.. there's a lot of lurkers.. who need to hear what i offer ... good luck with your garden... ken