Thread: how cool?
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Old May 16, 2017   #8
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,158

Being in 4" pots is better for cold tolerance than six-packs. I think it is the root zone temp getting too low that makes them sick. I would trust 4" pots down to about 40 degrees or so. Six-packs start to get sick for me when I let them get below about 50 at night. Microdwarfs and PL varieties get cold-sick for me the easiest.
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