Originally posted by Marknewbie
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Ericaceous compost will slowly lose it's acidity to the surrounding soil. If you add more ericaceous compost each year (perhaps as a half-to-one-inch-thick mulch in late winter (Jan-Feb) each year), you should be able to keep the soil sufficiently acidic to keep the plants happy.
Although the worms will carry away some of the ericaceous compost in the planting holes, they will also move the mulch around - which will get the ericaceous compost back into the ground again.
I think that you're worrying too much.
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If the blueberries are not happy, you should see various tell-tale signs that would give you a chance to act.
I would look out for such things as; lack of growth, large numbers of discoloured or dying leaves, or small limpet-like creatures in large numbers on the stems (about 3mm in size and dark brown). Those little critters attack unhappy plants a year or two before the plant dies. If you see the little limpets in large numbers, you need to find out what's wrong. Finding the odd one is not cause for concern.
I had the little limpets on a plum tree a few years ago. I acted on the warning sign and found that the problem was that the compost rootball (it was bought as a pot-grown tree) had shrunk in dry weather and the roots had not been able to grow through underground air pockets. The tree was moved and it now has no "limpets".
I had the same problem with a Williams pear tree; the limpets warned of a problem. The problem was that a large root from my Whitebeam tree (15ft away!) had grown a long way and was right under the baby pear and sucking all it's nutrients and moisture.
Last year, my Grenadier/M9 apple was very badly attacked by aphids. I noticed during the winter that it had a low-level "limpet" colonisation. I suspect that it was the stress of the aphid attack. I will be watching things closely this year.
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