Minimum temperature for tropical amaryllids?

Diana Chapman
Thu, 23 Apr 2015 12:56:13 PDT
I have heated benches for some Brazilian species, but don't have enough 
room for all, so most go on to the regular benches when they are past 
the seedling stage. My greenhouses go down to near freezing in the 
winter, but not for long, no sustained cold temperatures.  I have only 
lost a few to cold.  They normally go down to the 40's here at night.  I 
would just cover up your more tender species.

> 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
> species.
> 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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