When to prune thuja?
- Botanical name
- Thuja occidentalis
- Family
- Cupressaceae
Thuja is pruned from March to July. It is planted from September to February.
Thuja is a woody perennial.
Thuja through the year
- pruning
- planting
In short
Growing conditions
Pests and diseases
Listed here is every problem for which the sources name this plant as a host. The problems are not listed in order of how common they are.
Honey fungus
disease- Signs
- The plant dies suddenly, often in mid season and without any decline beforehand. Peel the bark at ground level and under it there is a white or cream sheet of fungal tissue, thin as the skin of a mushroom. In the soil there are black or brown strands like bootlaces. In late summer and autumn tufts of honey brown mushrooms with a whitish ring on the stalk appear by the stumps or over dead roots.
- Prevention
- The fungus spreads through the soil with its strands, from a few centimetres to a good hand's width below the surface, and infects the roots of a living plant when it touches them. So do not leave stumps and dead roots in the ground. No plant is completely resistant, but the source names privet, lilac, viburnum, weigela, forsythia, butterfly bush, rhododendron, thuja and walnut as particularly susceptible.
- What to do
- There are no products. The only thing that works is digging out and removing every infected root and stump, which takes away the food without which the strands in the soil do not grow. A vertical barrier of rubber or thick plastic sheet, buried about half a metre deep and standing a few centimetres above ground, stops the spread into an unaffected part of the garden.
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Related plants
The plant below is in the same botanical family (Cupressaceae).
Sources about the plant: DGUV Information 202-023 „Giftpflanzen, GBIF Backbone Taxonomy, Informationszentrale gegen Vergiftungen, Universitätsklinikum Bonn, Iowa State University Extension, NC State Extension Plant Toolbox, Oregon State University, Penn State Extension, Royal Horticultural Society, Wikidata. Checked between 14 and 28 August 2026.