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Re: [GWL]: Birch question/pollen

  We ought to consider some pollen-free selections as substitutes for birch trees of all kinds. In some areas, especially in Northern Europe, birch trees are the most common street trees and contribute hugely to yearly springtime urban pollen allergy. One of the most prominent allergists in Europe said last year, in a Der Spiegel article on just this, "It makes no sense whatsoever to plant any more birch trees in our cities."
  I would agree. 
  Off hand, I'd suggest using somewhat similar trees, such as Populus 'Noreaster,' a sterile female (pollen-free)tree, or perhaps P. thevestinia, another handsome female tree, or even something perfect-flowered such as one of the ornamental plums. We have enough wind-pollinated, high allergy trees in our cities already.
-----Original Message-----
From: Jane Milliman <jmilliman@earthlink.net>
Date: Tue, 25 Sep 2001 14:10:23 -0400
To: Gardenwriters@topica.com
Subject: [GWL]: Birch question


> Was someone asking about alternatives to paper birch? I asked someone who
> always has answers to these kinds of questions (what tree to sub for what
> tree‹he¹s a nursery stock broker) and he said...
> 
> You have 2 choices. Betula japonica ŒWhitespire¹ Or Schezchuanica. Not quite
> as white. Somewhat borer and leafminer resistant. Not a bad plant. Also
> Betula jacquemonte ­Himalayan birch. Real white at an early age but is a
> pest ŒMagnet¹. 
>  -- 
>     Jane Milliman <jmilliman@earthlink.net> or  <ugj@aol.com>
>     Publisher
>     Upstate Gardeners' Journal
>     3207 East Ave., Caledonia, NY 14423
>     phone: 716/889-6390
>     fax: 716/889-6392
> 
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