Minimum temperature for tropical amaryllids?

Nicholas plummer
Thu, 23 Apr 2015 08:14:08 PDT
For the past couple of weeks, I have been moving my potted plants from the
greenhouse to the outdoor benches where they spend the summer.  I usually
wait until night temperatures are reliably in the 50s, but the forecast for
tonight is 39 F (4 C) followed by several nights in the upper 40s (~9 C).
Days will be in the mid 60s.  I'm worried that this might be too cold for
tropical amaryllids, particularly if we get rain on Saturday.  The plants
include Eucrosia and Clinanthus species, assorted Brazilian Hippeastrums
(H. aulicum, H. calyptratum, H. papilio, etc), and several Cyrtanthus

I don't really have a feel for how cold sensitive these plants are.  Should
I haul them back into the heated greenhouse for a couple of days (a
significant amount of work), or am I worrying unecessarily?

Nick Plummer
Durham, NC, Zone 7

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