I have some bilberry plants (european blueberry, Vaccinium Myrtillus) growing in containers on my balcony, and I just noticed that new leaves are deformed and discolored (a bit more yellow that the rest of the plant).

Some images:

blueberry deformed leaves 1

blueberry deformed leaves 2

blueberry deformed leaves 3

Some more context:

  • The soil has a Ph of approx. 4.5 (according to the vendor)
  • It has been very sunny and hot in the last days (more than 25° C ambient temperature, perhaps more than 30 on the balcony)
  • The blueberries are under direct sunlight from early in the morning to about 4pm
  • I am watering lightly with distilled water and vinegar (1ml/l) once every few days if it doesn't rain. The solution should have a Ph of around 4
  • Last week I have inoculated the roots with ericoid mycorrhiza

Can please someone help? Should I fertilize/water more?

Thank you.


The crinkled new leaves seem to grow up healthy and overall the plants are doing great. bilberry flowers

  • 1
    I am surprised: where I live, v. myrtillus is growing wild in the forests, but never in full sun, always in dappled shade?
    – Stephie
    Commented Jun 12, 2021 at 12:19
  • In the Alps I've always seen it growing in full sun in large colonies, albeit with a lower temperature than 25C.. Commented Jun 12, 2021 at 15:53

1 Answer 1


I've seen this happen for 2 different reasons. When I buy plants from a nursery that uses synthetic fertilizers and I use organic. And when I take them outside in the spring. If you're watering every few days with vinegar your probably getting too acidic. These 2 links may help. I've used baking soda on my plants forever. I don't mean any harm, I use vinegar to kill weeds. Vinegar, dawn dish soap and sugar is better than roundup.



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