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Archive for the ‘Questions’ Category

Or, ‘This is not a tree’. Thinking again about, and then past the pollen issue, I wonder if humans had such strong allergic reactions in pre-industrial times. In much the same way that we have been using the world’s oceans as a dumping ground for every substance we don’t want to deal with, we have [...]

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On Saturday the Times published two letters that responded to its recent op-ed piece by Thomas Lee Ogren on trees, pollen, and allergies. One reader, Christine Lehrer, wrote: Honeybees collect pollen from the very trees that are causing all the sneezing and runny noses. By taking a spoonful of honey daily, approaching and during allergy season, you [...]

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Toby’s latest post in his site engineering series reminded me that there’s yet another consideration in how we define slope — the audience to whom we’re communicating. When I’m discussing the pitch of a walk with another landscape architect, I’ll talk about it as a percentage (“From the wall to the driveway the walk slopes [...]

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One reader wrote in with this comment to my last post: “It would be no good to specify bare root unless you were thoroughly acquainted with the land – soil, ledge, utility lines, for example – and spreading roots of other trees.” And my answer, because there’s a lot to it: Actually, bare root is [...]

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Make it better

My initial impulse is to add a truckload of small birches (or mixed saplings), enough small shrubs to defend the islands from foot traffic, and fill the rest in with exuberant perennials. But that’s just an initial impulse. What are some other possibilities?

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Question: Mixing Soil

How is it done?  What kind of equipment is used?  What does it take to assure a consistent blend?

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Two advantages of green roofs are their ability to cool the building below and the air above, and to reduce stormwater runoff volumes, thanks to the transpiration of moisture through their leaves.  The most common green roof plant are species of Sedum.  Those plant can survive drought conditions in the rooftop environment in part because [...]

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Mulching against tree trunks promote adventitious roots, some of which can grow into girdling roots that weaken the tree. Does this pertain equally to inorganic mulches, such as pea stone?  Do they promote adventitious roots, and if so, do those grow into girdling roots?  If inorganic mulches offer advantages, what practices are required to maintain [...]

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