Troubleshooting
Dwarf Japanese Yew problems — and how to fix them
Dwarf Japanese Yew (Taxus cuspidata 'Nana') is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Root rot in compacted or waterlogged soil
Despite its hardiness, Taxus cuspidata 'Nana' is susceptible to Phytophthora root rot when drainage is poor. Foliage yellows and then browns from the base; roots show dark discolouration. Site carefully in well-drained positions and avoid heavy clay without amelioration.
Black vine weevil (Otiorhynchus sulcatus)
Adult weevils notch leaf margins at night in summer, but the far more damaging larvae feed on roots from late summer through winter, girdling and killing young plants. Apply beneficial nematodes (Steinernema kraussei) in moist soil conditions in September for biological control.
Prevent dwarf japanese yew problems before they start
Most dwarf japanese yew issues are care-mismatch, not bad luck. Dial in the basics:
Dwarf Japanese Yew problems — FAQ
Why is my dwarf japanese yew root rot in compacted or waterlogged soil?
Despite its hardiness, Taxus cuspidata 'Nana' is susceptible to Phytophthora root rot when drainage is poor. Foliage yellows and then browns from the base; roots show dark discolouration. Site carefully in well-drained positions and avoid heavy clay without amelioration.
Why is my dwarf japanese yew black vine weevil (otiorhynchus sulcatus)?
Adult weevils notch leaf margins at night in summer, but the far more damaging larvae feed on roots from late summer through winter, girdling and killing young plants. Apply beneficial nematodes (Steinernema kraussei) in moist soil conditions in September for biological control.