[nafex ibiblio list] Nitrogen-fixing shrubs: risk for fire-bligh in pear & questions re: suckering

Anton Callaway marillen at earthlink.net
Mon Jan 2 20:24:51 EST 2012

There is little likelihood that proximity to nitrogen-fixing shrubs will increase fireblight susceptibility or decrease winter-hardiness.  Nitrogen fixed by the bacterial/shrub partnership is mostly used by the host plant (until it dies and breaks down).  Even then, the nitrogen is released slowly- not at all like synthetic fertilizers.

If you were planting in a plot that followed plowed-under annual legumes, you might have something to worry about, but I doubt that you'll have any increased problems from partnering with N-fixing shrubs.


-----Original Message-----
>From: Steven Covacci <filtertitle at aol.com>
>Sent: Jan 2, 2012 12:35 AM
>To: nafex at lists.ibiblio.org
>Subject: [nafex ibiblio list] Nitrogen-fixing shrubs: risk for fire-bligh in pear & questions re: suckering
>I was planning on planting some nitrogen-fixing shrubs (sea-buck thorn; goumi; buffaloberry) about 15 to 20' away from of an Asian pear - then, I realized that excess nitrogen in the soil will encourage fire-blight, unfortunately.
>1. Does it sound safe to say that the goumi (Elaeagnus multiflora) is the least likely to have roots that would extend far from the plant?  I assume that it doesn't spread via rhizome, that it only suckers around its base?
>2. If I plant sea-buckthorn (Hippophae rhamnoides) and buffaloberry (Shepherdia argentea) next to my lawn, will suckers extending from the plant that typically form new (yet clonal) plants at a distance from the original if I put that rubber/plastic weed barrier strip around the plant.  
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