In existing soil, meaning whatever I have on the ground? I wish I had a garage, so much easier, but unfortunately I don’t have one.

= do not amend planting hole or vicinity. If ground there really seems too poor and dry for bamboo - even with ongoing fertilization, mulching and watering - then excavation and replacement of existing soil only lasting remedy.

If you are talking about Phyllostachys rubromarginata planting site also needs to have room for indefinite below ground spread characteristic of running bamboos.

@Embothrium thank you for your help. Yes I was referring to that species. I have some room, though I thought this time of year it’s not growing much under the ground?

would you know when I would dig it back up and place back into the container? When would be the least shocking for it?

If you're just trying to overwinter outdoors plunge the pot into a pile of material like bark mulch or wood chips big and deep enough to cover all of it and located in a sheltered spot.

Ok so I tried to get the bamboo out of the container and wow is it stuck. I don’t know how smart this is because the Small roots look fragile and they are all over the place.

here’s some pictures.

I’m going to have to leave it inside the container but it’s way too big and heavy to move it in the ground

now I need advice how to winterize it Bubble wrap? Foam? What do you think?

container size is 6ftx2ft