Troubleshooting
English Walnut 'Lara' problems — and how to fix them
English Walnut 'Lara' (Juglans regia 'Lara') 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.
Spring frost on early growth
'Lara' leafs early, so its tender shoots and catkins can be killed by late frosts; avoid frost-pocket sites and consider overhead protection in marginal areas.
Walnut blight
Wet weather on early foliage spreads Xanthomonas, blackening nutlets; copper sprays from budbreak and dry, airy sites reduce damage.
Codling moth
Caterpillars tunnel into nuts causing drop; pheromone monitoring and well-timed controls protect the crop.
Zinc/boron deficiency
Micronutrient shortfalls cause little-leaf and poor set; correct with foliar zinc and boron guided by leaf testing.
Prevent english walnut 'lara' problems before they start
Most english walnut 'lara' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for english walnut 'lara' in general rather than its problems? Read the full english walnut 'lara' care guide — light, water, soil and feeding.
English Walnut 'Lara' problems — FAQ
Why is my english walnut 'lara' spring frost on early growth?
'Lara' leafs early, so its tender shoots and catkins can be killed by late frosts; avoid frost-pocket sites and consider overhead protection in marginal areas.
Why is my english walnut 'lara' walnut blight?
Wet weather on early foliage spreads Xanthomonas, blackening nutlets; copper sprays from budbreak and dry, airy sites reduce damage.
Why is my english walnut 'lara' codling moth?
Caterpillars tunnel into nuts causing drop; pheromone monitoring and well-timed controls protect the crop.
Why is my english walnut 'lara' zinc/boron deficiency?
Micronutrient shortfalls cause little-leaf and poor set; correct with foliar zinc and boron guided by leaf testing.