My Toyas are turning yellow this year. is there any way to fix it?

Question

The trees are planted in 40 liters containers 5 years ago. My zone goes from full summer (up to 34c) to harsh winter (-5c).

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Answer 1

This can have a few causes. Colder than usual weather is the most common. Other reasons can include sun burn, lack of nutrients (This is very likely in container) and fungal infections from wet weather.

These articles will help:

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/winter-damage-to-arborvitae.htm

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/fertilizing-arborvitae-trees.htm

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/growing-arborvitae-trees.htm