Sophora secundifolia - Mescal Bean


I have a small, seed raised Sophora secundifolia (Mescal Bean Shrub) 
that I am raising as a potted plant. 
(http://www.execpc.com/~llmen/secundifolia.jpg)
and I am wondering how much frost it can take without damaging the 
leaves.  While this particular plant may be too young to flower, I 
have heard that some chilling is necessary for good flowering.  It is 
rated to Zone 7 and higher.  I am thinking of placing it outdoors 
while the temps are still quite cool - lows in the mid to upper 20's 
(if it gets real cold, I can always bring it in for the night).

Any suggestions?

-- 
Don Martinson
Wauwatosa, Wisconsin (Milwaukee suburb)
USDA Zone 5 (-10 to -20F)
AHS Heat Zone #4,  Map at:
(  http://www.suite101.com/userfiles/79/hz1024.jpg )

l*@execpc.com


   

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