Troubleshooting
Nandina Harbour Dwarf problems — and how to fix them
Nandina Harbour Dwarf (Nandina domestica 'Harbour Dwarf') 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.
Unwanted spreading
Rhizomes can colonise beyond the intended bed. Install a root barrier or edge regularly; in some regions Nandina is considered invasive, so check local guidance.
Muted autumn colour
Too much shade or high-nitrogen feeding keeps foliage green. Site in fuller sun and ease off fertiliser for the best bronze-red winter display.
Iron chlorosis
Yellowing leaves with green veins point to iron deficiency in alkaline or wet soils. Improve drainage and apply chelated iron or acidify the soil.
Bare centres in old plantings
Mature colonies can open up in the middle. Cut the oldest, tallest canes to the ground in early spring to rejuvenate dense, low growth.
Prevent nandina harbour dwarf problems before they start
Most nandina harbour dwarf issues are care-mismatch, not bad luck. Dial in the basics:
Looking for nandina harbour dwarf in general rather than its problems? Read the full nandina harbour dwarf care guide — light, water, soil and feeding.
Nandina Harbour Dwarf problems — FAQ
Why is my nandina harbour dwarf unwanted spreading?
Rhizomes can colonise beyond the intended bed. Install a root barrier or edge regularly; in some regions Nandina is considered invasive, so check local guidance.
Why is my nandina harbour dwarf muted autumn colour?
Too much shade or high-nitrogen feeding keeps foliage green. Site in fuller sun and ease off fertiliser for the best bronze-red winter display.
Why is my nandina harbour dwarf iron chlorosis?
Yellowing leaves with green veins point to iron deficiency in alkaline or wet soils. Improve drainage and apply chelated iron or acidify the soil.
Why is my nandina harbour dwarf bare centres in old plantings?
Mature colonies can open up in the middle. Cut the oldest, tallest canes to the ground in early spring to rejuvenate dense, low growth.