Troubleshooting
Weeping European Larch problems — and how to fix them
Weeping European Larch (Larix decidua 'Pendula') 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.
Larch canker (Lachnellula willkommii)
Fungal cankers girdle branches and the main stem, causing die-back. Prune infected wood well below the canker margin in dry weather and sterilise tools. Improve drainage and air circulation.
Larch woolly aphid (Adelges laricis)
White woolly masses appear at the base of needles in spring, causing needle distortion and early drop. Treat with a systemic insecticide or horticultural oil in early spring before bud break.
Poor weeping structure without staking
Without a firm stake tied to the graft union, the leader can lean or the crown becomes lopsided. Stake firmly for at least 3 years after planting and check the tie annually to prevent girdling.
Prevent weeping european larch problems before they start
Most weeping european larch issues are care-mismatch, not bad luck. Dial in the basics:
Weeping European Larch problems — FAQ
Why is my weeping european larch larch canker (lachnellula willkommii)?
Fungal cankers girdle branches and the main stem, causing die-back. Prune infected wood well below the canker margin in dry weather and sterilise tools. Improve drainage and air circulation.
Why is my weeping european larch larch woolly aphid (adelges laricis)?
White woolly masses appear at the base of needles in spring, causing needle distortion and early drop. Treat with a systemic insecticide or horticultural oil in early spring before bud break.
Why is my weeping european larch poor weeping structure without staking?
Without a firm stake tied to the graft union, the leader can lean or the crown becomes lopsided. Stake firmly for at least 3 years after planting and check the tie annually to prevent girdling.