hardiness of plants in pots; was: Re: [pbs] Ferraria in containers

Jim McKenney jimmckenney@starpower.net
Wed, 22 Dec 2004 17:58:08 PST
At 10:16 AM 12/22/2004 -0800, Don Mahoney wrote:

>Last year it had 10 or 12 flowers, I have it in a deep 10" clay pot in
half >sand and half peat and it gets liquid fertilzer 3 or 4 times during
the >growing season. They are really suseptible to frost and I've lost
every one >I've left out when it gets below 30 F. Don Mahoney Richmond, Ca.

Plants growing in pots are (or should be known as) notoriously less hardy
than their congeners growing in the ground. Even plants which survive
brutally cold conditions in the ground will often die during an overnight
freeze when growing in a small pot above ground, particularly if the pot
does not touch the ground. 

I was reminded of this earlier this week when the first really cold
temperatures of the winter arrived. Overnight it suddenly went from
comfortably cold to 11 degrees F. For the most part I was prepared, but a
big pot of Disporopsis fuscopicta on the ground looks pretty sad now. 

Jim McKenney
Montgomery County, Maryland, USA, USDA zone 7, where Oxalis braziliensis is
blooming on the light table near some newly germinated eighteen-year-old
seed of Ipomoea tricolor Wedding Bells and newly germinated ten-year-old
seed of Tropaeolum peregrinum.  


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