Troubleshooting
Dwarf Blue Lawson Cypress problems — and how to fix them
Dwarf Blue Lawson Cypress (Chamaecyparis lawsoniana 'Minima Glauca') 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; caused by waterlogged soil. Symptoms include yellowing foliage, branch dieback from the base, and a reddish-brown discolouration of the bark at the root collar. Improve drainage immediately and avoid over-irrigation; no effective chemical cure exists once established.
Cypress aphid (Cinara cupressi)
Large, grey-brown aphids colonise stems in spring and early summer, causing yellowing patches and premature browning of foliage. Check stems in late winter; treat with a pyrethrin-based insecticide or encourage natural predators such as ladybirds.
Prevent dwarf blue lawson cypress problems before they start
Most dwarf blue lawson cypress issues are care-mismatch, not bad luck. Dial in the basics:
Dwarf Blue Lawson Cypress problems — FAQ
Why is my dwarf blue lawson cypress phytophthora root rot?
The most serious threat; caused by waterlogged soil. Symptoms include yellowing foliage, branch dieback from the base, and a reddish-brown discolouration of the bark at the root collar. Improve drainage immediately and avoid over-irrigation; no effective chemical cure exists once established.
Why is my dwarf blue lawson cypress cypress aphid (cinara cupressi)?
Large, grey-brown aphids colonise stems in spring and early summer, causing yellowing patches and premature browning of foliage. Check stems in late winter; treat with a pyrethrin-based insecticide or encourage natural predators such as ladybirds.