Ziziphus (jujuba) is a member of Rhamnaceae (sister group to Elaeagnaceae -
Buckthorn, containing Autumn-olive); not all member of Rhamnaceae are
nitrogen-fixing, although many are. Yet, there are even members of Ulmaceae
(Elm) and Rosaceae (Rose) that have nitrogen-fixing members of the family.
Ceanothus (NJ tea, etc.), a member of Rhamnaceae, engages in nodular
fixation, but as for Ziziphus - I could have sworn I read that it, too, fixes
nitrogen. I couldn't find anything supporting my assumed recollection of
this, however. So, unless someone tells me otherwise, I will not longer know
jujube to be a nitrogen-fixer... ha, I actually planted it along the
vegetable garden believing it would fix nitrogen!
Steve; NJ 6b/7a
Date: Tue, 10 Jan 2012 21:42:32 -0500
From: Alexander Brands <abb7@Lehigh.EDU>
Subject: [nafex ibiblio list] Jujube nitrogen fixing?
To: nafex@lists.ibiblio.org
Message-ID: <20120110214232.82363j6czg5hllw8@imp6.cc.lehigh.edu>
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> From: Steven Covacci <filtertitle@aol.com>
>
> As for nitrogen-fixing trees, jujube (Ziziphus jujuba)
Steve, where have you heard that Jujube is nitrogen fixing? I can't
find any documentation to that effect.