Troubleshooting
Japanese Holly 'Sky Pencil' problems — and how to fix them
Japanese Holly 'Sky Pencil' (Ilex crenata 'Sky Pencil') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Splaying / opening up
Heavy snow, ice, or shade can spread the narrow column apart. Tie stems loosely for winter, brush off snow, and site in good light to keep it tight.
Root rot
Phytophthora and black root rot strike in wet, poorly drained soil, causing wilt and dieback. Plant high in free-draining soil and never let roots stay soggy.
Spider mites
Hot, dry conditions bring stippled, dull foliage and fine webbing, especially on stressed container plants. Rinse foliage and treat with horticultural oil.
Leaf chlorosis
Pale, yellow leaves in alkaline soil from iron lockout. Acidify the soil, mulch with pine needles, and apply chelated iron to restore green colour.
Prevent japanese holly 'sky pencil' problems before they start
Most japanese holly 'sky pencil' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for japanese holly 'sky pencil' in general rather than its problems? Read the full japanese holly 'sky pencil' care guide — light, water, soil and feeding.
Japanese Holly 'Sky Pencil' problems — FAQ
Why is my japanese holly 'sky pencil' splaying / opening up?
Heavy snow, ice, or shade can spread the narrow column apart. Tie stems loosely for winter, brush off snow, and site in good light to keep it tight.
Why is my japanese holly 'sky pencil' root rot?
Phytophthora and black root rot strike in wet, poorly drained soil, causing wilt and dieback. Plant high in free-draining soil and never let roots stay soggy.
Why is my japanese holly 'sky pencil' spider mites?
Hot, dry conditions bring stippled, dull foliage and fine webbing, especially on stressed container plants. Rinse foliage and treat with horticultural oil.
Why is my japanese holly 'sky pencil' leaf chlorosis?
Pale, yellow leaves in alkaline soil from iron lockout. Acidify the soil, mulch with pine needles, and apply chelated iron to restore green colour.