Mysterious tree failure…

Here is this week’s plant puzzler.  This mature tree just fell over one summer day.  There had not been any significant wind, the soil was well-irrigated (but not overly wet), there had been no construction work or other root-zone disruption.  There were no significant pest or disease problems.  I’ve posted two photos from different angles, and will show one more photo on Monday.  Why do you think the tree failed?

10 thoughts on “Mysterious tree failure…”

  1. That's a pretty small area for such a large vase shaped tree. Perhaps competition from the groundcover/shrubs and constricted area prevented it from growing adequate roots to anchor such a tall tree.

    You've got on three sides two sidewalks and the concrete house foundation which could block roots.

    Based on the shape of the tree it looks pretty tall and top heavy.

  2. I'd be more inclined to say poor planting stock. The amount of young trees I've seen with root curling and j-rooting being put in landscapes is terrifying. They're accidents just waiting to happen. A lecturer of mine told a funny story regarding a new Melbourne housing estate back in the 80s, and the planting stock they used as street trees. The stock was poor to say the least. He was called out as an expert arborist to consult on why the street trees weren't doing so well about a year after they were planted. He and a colleague went down one street of the new estate and simply pushed and pulled on the young trees' main stems. When the stem didn't flex, but rather moved at the base, they began pulling the trees out of their planting holes with little to no effort. Every single tree on the estate was root bound at the time of planting and consequently hadn't grown lateral roots beyond the original coiled root mass. The housing estate developer had to replace every. single. tree. I'll say the same thing has happened here.

  3. Mower blight damaged the bark- the interior rotted leaving only a cylinder of good wood to support the tree. The trunk looks like it snapped off just above ground level. We lost a 350 yo oak in a similar way. Early fall, ground dry, no wind, midday "Craaaccckkk" and "Thud", a big cloud of dust and a bunch of shocked and saddened people.

  4. I agree with SJ — little room for rooting. But the tree obviously did root in and grow to that size. Hard to tell from the photo, but was it sitting on/next to a boulder or piece of ledge? What baffles me is the breaking off at the trunk. The tree's sitting in a planting bed, where weed whackers and mowers would be unlikely to go. Damage low on the trunk often comes from some kind of bad root issue, like the kinds Jimbo describe. So maybe it was the lack of rooting space, and the tree hit some kind of ultimate tipping point (so to speak) underground, which translated to trunk trauma, and then that big canopy caught a high wind? Hmm. Still — perhaps there's more to the story.

  5. Ok. Here's another idea. The tree being planted in an area surounded by sidewalk,house,drive was essentially planted in a "container". Such sitings usually include no removal of burlap, twine, basket, etc. A "quick & dirty" planting of a big-impact tree is only temporary. Ka-boom!

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