Troubleshooting
Dwarf Common Juniper problems — and how to fix them
Dwarf Common Juniper (Juniperus communis 'Compressa') 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.
Phytophthora root rot
The most serious threat to 'Compressa' — waterlogged soil allows Phytophthora species to kill roots rapidly, causing sudden browning and collapse of the entire plant with no recovery. Plant only in free-draining soil or raised beds; there is no effective treatment once established.
Juniper scale (Carulaspis juniperi)
Small white armoured scales encrust needles and stems, causing yellow mottling and premature needle drop. Treat with horticultural oil in late winter or early spring before the crawlers emerge; repeat applications may be needed for heavy infestations.
Prevent dwarf common juniper problems before they start
Most dwarf common juniper issues are care-mismatch, not bad luck. Dial in the basics:
Dwarf Common Juniper problems — FAQ
Why is my dwarf common juniper phytophthora root rot?
The most serious threat to 'Compressa' — waterlogged soil allows Phytophthora species to kill roots rapidly, causing sudden browning and collapse of the entire plant with no recovery. Plant only in free-draining soil or raised beds; there is no effective treatment once established.
Why is my dwarf common juniper juniper scale (carulaspis juniperi)?
Small white armoured scales encrust needles and stems, causing yellow mottling and premature needle drop. Treat with horticultural oil in late winter or early spring before the crawlers emerge; repeat applications may be needed for heavy infestations.