I used to not tube mine--only cages, but no more. The tubes are cheap insurance. I use 60" Miracle Tubes from Tree Pro. Stake them with metal rebar or t-posts and leave them. The tree will be spindly in year one as it is trying to reach the light at the top--and reach it they will. The trunks will thicken over year two and three. The stakes can be removed by year 4 and the tubes will degrade enough that the growing tree will split and shed them in time. Keeps bucks from rubbing as well. Only real issue I have with tubes is wasp building nests in them, but that can be fun too because they can't escape when you spray wasp killer in there.