Helping Thuja ‘Whipcord’ thrive: the detail that matters more than sun
You have it outdoors in partial shade with steady soil moisture, which suits ‘Whipcord’ fairly well. The deciding factor is more often what the soil does during autumn and winter.
Thuja ‘Whipcord’ is a slow-growing, weeping dwarf form that usually does best in a sheltered position where it does not become too dry. Your outdoor position in partial shade with normally consistent soil moisture is broadly right, especially away from the strongest midday sun.
The most important thing is good drainage even when the soil is moist. ‘Whipcord’ does not like staying wet for long, and in September in Hartungviken, Sweden, it is sensible to consider autumn rain and winter moisture already. If the soil is heavy, coarse organic matter and a little gravel can help give the roots air.
Give it the right conditions
- The soil should be humus-rich, well drained and evenly, lightly moist.
- Partial shade is fine, but it can also cope with more sun if the soil does not dry out.
- Water during prolonged dry spells rather than giving frequent little splashes.
- A thin layer of bark or another organic mulch can help even out moisture and protect the roots.
- Feed sparingly in spring, rather than late in the season as it moves towards dormancy.
If it starts thinning, browning from inside or looking droopy, root-zone stress is more often responsible than too much shade. Check drainage, compacted soil and whether water stands after rain first. Spring is the next useful checkpoint: if it looks healthy and firm then, it has probably come through winter well.
Sources and images 1
- Original reader contribution ↗Reader question