Posted: 30/05/2017 at 13:03
If they have not dried out, the other possibility is that the drainage in the pot has become blocked and they have been standing in water, causing the roots to rot. This happened to one of mine a few years ago and it turned out that the soil-based ericaceous compost was simply too heavy and provided very poor drainage. While they need lots of water, they also require good drainage especially over the winter in the UK due to the high rainfall.
Since then I have been using peat-based ericaceous and no more have succumbed to root rot (I have more than a dozen plants, all in large containers.)
One way of telling if the roots have rotted is to try and (gently) lift the pot by holding the blueberry stems. If it comes out easily with hardly any roots then you know the cause.
Last edited: 30 May 2017 13:04:54