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Asked by
klubben on
April 21, 2016
Carleton, NE

Q. replanting a windbreak

We recently cut down a row of old lilac bushes that were becoming unsightly. We left about a foot stump on the lilac bushes and put Tordon on the stumps hoping they will die and we can pull them out. We want to replace the lilacs with a row of Thuja trees so we still have the privacy and windbreak. How long do we need to wait to remove the stumps and plant the trees?

Answered by
Downtoearthdigs on
April 22, 2016
Certified Expert
A.

You will need to spray the stump liberally with a herbicide.
This will move throughout the system and kill the roots.
You will need to then dig up the roots.
Watering the ground around the tree will help loosen the root system.
Work in a circle to pry the root ball from the ground.
After removing the root ball and roots, fill the hole with top soil.

The amount of time it will take to kill the tree will depend on the concentration of the herbicide and the size of the tree.

It can take any where from 1 to 6 weeks according to my research.

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Asked by
Anonymous on
May 13, 2018

Q. Thuja Branch Die-off

This spring I noticed that several of my thuja green giant arborvitaes have dead branches and leaves. I am not sure why this is happening, they have been in the ground three years and never had this issue.

Asked by
l4zl0w on
February 3, 2019

Q. Is THUJA PLICATA a good choice for privacy next to a wooden fence?

I’m looking for a plant that can extend the hight if our wooden fence and I found THUJA PLICATA.

Is this a good choice for a small garden and how far away from the wooden fence should I plant them? Max height they will be trimmed to is 7-8 feet.

Many thanks

Answered by
drtreelove on
February 4, 2019
Certified Expert
A.

Thuja plicata, western red cedar (the species which is native to the US Pacific Northwest and naturalized in the UK) is a very large growing tree and not appropriate for your small garden.

But there is a smaller hybrid Thuja/arborvitae called "Green Giant" which is popular as hedge plant. This variety may still grow too big for your small garden.

Plant it at least 3 feet from the fence for a 5 year plan, preferably 6 feet or more on a 10 - 20 + year plan, to allow for foliar spread and maintenance access.

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/grow-green-giant-arborvitae.htm

http://www.thujagreengiant.net/how-far-apart-do-you-plant-thuja-green-giant/

Depending on where you are located and availability (not sure what "l4zl0w" means) you may also consider, boxwood, privet, Japanese holly or other; or extend your fence height with a trellis and grow a vine like ivy to achieve the screening you need.

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