I'm not familiar with this effect. It seems to be getting worse by the day. Is there a common cause for something like this?



  • I'm finding it difficult to work out what's going on from the photos you've posted - can you post a couple more taken from further away, showing more of the area please? Are there any large trees, a river, a well, a spring or body of water nearby, or a water supply pipe? Is the soil that's rising very wet? How widespread is this effect in terms of size of area?
    – Bamboo
    Commented Sep 26, 2017 at 10:04

1 Answer 1


This phenomenon may be explained by the presence of moles in your garden. I am no expert on the lives of moles, but I have a similar situation around my house. They seem to prefer to dig soil up around fixed structures, such as walls, for some reason. When I first moved here, I would dig the soil back with a shovel or water the raised sections every time I see new activity, and eventually they appear to have given up and diverted their tunnels elsewhere.

  • 1
    Why in the world would they try an entire strip of my patio? Haha but really, its been 3 days and its worse everytime i look. Are they just repeatedly trying to get up?
    – hack3rfx
    Commented Sep 26, 2017 at 0:42
  • so there should be vole holes somewhere? Commented Sep 26, 2017 at 2:26
  • Possibly some kind of rodent is digging just beneath the patio. Holes sometimes difficult to spot. Or the effect of water. Difficult to say.
    – J. Chomel
    Commented Sep 26, 2017 at 5:47
  • 2
    I don't know why someone felt the need to down vote but you were correct. I found lines of mounds next to the patio today. He's been a busy mole. I'll make him my pet.
    – hack3rfx
    Commented Sep 26, 2017 at 23:26

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