I read one recommendation to cut a circle around the root ball with a root cutting spade in late fall 2020 and leave in place. I thought I could do some hard pruning in the spring of 2021 to stimulate more back budding over that growing season. I think a goal of saving only 3 main trunks would be best?? And then plan to excavate it in the early spring of 2022. One suggestion I read was to cut a trench around it and fill it with sand or other rooting media for the 2021 growing season to stimulate feeder root formation closer to the center of the eventual root ball. Do you all think that is a reasonable plan?
well, considering:
Maybe best to cut the "surface" roots this year, let it root in nice fluffy moist substrate for a year and next year do the dig?
I would say, yeah. I am not sure what the weather is where you are, and how dry it gets. If you normally have moist conditions, I would consider cutting some of the roots now. If it is generally dry conditions I would bet that putting a bucket of water near the main trunk every few days for the rest of summer would help enourmously to stimulate feedroots near the trunk.
If you cut back drastically keep in mind that Yews store some reserves and it will deplete these to recover, which might make it weaker for the first year. To be honest, I would cut back OR do the roots.
It all depends on how long a game you are playing. It will be a 5 year process to get it into a box. The safest rout would be to cut the main roots in fall (Assuming no deep frosts, else wait till spring), keep the core area lightly moist and wait for a growing season. Then cut to size and decide whether there is enough green left to support the plant when lifted. If not, let it recover and only the year after lift it.
The gutsy route is the way most people have to dig: Go in as soon as you see the buds starting to break. Cut the branches back. Cut the roots to size. Lift. Plant in a large box with pumice. Pray.
I am an impatient person and I rather go fast and fail than work for 5 years to get it out. So this is how I would proceed.
Not based on anything but my own experience with Yew to date.
- Trim the shrub back to managable size, ensuring at least a handfull of large green branches, so you have a good wheelbarrow full of green still remaining on the tree. Leave ALL main trunks (As you do not know which will survive).
- Assuming it is not scroching hot and dry: Do a shallow trench around the trunk this month, maybe 1 1/2ft away from the trunk, 1 spade deep. (This will hit >50% of the main roots, but will still keep a 3ft diameter rootball. Also any deep roots that it will have remain intact. Aim is NOT to cut ALL main roots. Just the surface roots that you want to keep when digging.
- Backfill the trench
- Water the inner rootball so the toplayer of a feet or so stays moist for the rest of summer, triggering the finer roots near the trunk to take a bigger role
- At the for your region perfect time of year pull the thing out in 2021.
- Clean the outer rootball, but leave the core of the rootball intact, say, up to 6 inches from the trunk.
- Pot in a large wooden box with pumice. Tied down well. Keep out of dry winds, but allow morning/afternoon sun
- Keep the rootball on the dry side (And as it will be large, you will find it stays moist very long). Only spray the foliage
There are a few threads on Bnut on digging large yews. I would recommend reaching out to the posters of those and ask them what they did in the end and what the result was.