I doubt that covering that would cause any issues. You also might consider an inch or two of mulch vs adding soil. Something like pine bark mulch. The mulch over time will break down to rich organic soil.

Thanks fruitnut for the reply.

I'm glad to see that you're still hanging around here. I've read many of your posts on this forum, some dating back to 2011. I'm excited to try out your AS formula come spring, I hope I'll get good result like yours. May I ask, how are your blueberry plants doing? (http://forums.gardenweb.com/discussions/1462273/one-and-7-yr-blueberry-growth-with-pictures)

Back on topic, good to hear that I can cover up the pruned cane openning with soil without causing any issue, I'll do that once the wound is healed/sealed in a few days.

I did mulch my blueberry plants with coarse pine bark mulch for a while but it attracted a whole lot of fungus gnats and african black beetles to the plants. So i removed the mulch and covered up the soil with fly screen cutout instead. I think that may prevent the beetles from laying eggs in the pot but the fungus gnats are still an issue, though their numbers did reduced somewhat.

How do you control fungus gnats and beetle grubs infestations in your blueberry containers? Any tips? Thanks!

Since you're the blueberry expert around here, could I ask another question? About a month ago, I watered my blueberry plants with Potassium Permanganate (condy's crystals) solution to get rid off the beetle grubs infestation, it seemed to also kill off the ants and fungus gnats in the pots for a while. I'm not seeing any more ants on the plants. I'm tempted to use PP again to control the fungus gnats issue, but i'm not sure if PP is toxic to blueberry plants if used often (like once a month)?