Killing heat for azalea and Rhododendron cuttings
- While most of my cutting domepots are fully protected
by a large medium density Coolaroo shade cloth (which
restricts sunlignt by 64 to 70 percent), I do have a
few "vented" domepots in sun and part shade, AND one
(soon to be two) DomeBeds with cuttings stuck in a
soil/pine humus mix inside a closed dome (a 66-quart
clear storage box with two plugged vent holes in the
The DomeBed is in an area of tall pines and shaded
with a narrow (box width, lapping over ends in length)
piece of medium density shadecloth. I have been
concerned about the DomeBed getting so hot that heat
kills the cuttings. Before that happens I may need to
replace the small shadecloth with one that covers all
sides of the dome/box.
I have been daily monitoring temperatures via a
thermometer inside the dome and the appearance of the
cuttings (possible wilt or cupping of leaves).
Yesterday the air temp rose to 70 F, and the temp
inside the dome rose to 85 F. This is the highest the
temperature has risen to since I stuck cuttings inside
it in early December. I think this indicates that the
DomeBed will overheat on hotter days unless I use a
larger, better covering shade cloth or remove the
plugs in the 1.5 inch vent holes.
My questions are: In greenhouses what is the minimum
killing heat/temperature for azalea and Rhododendron
cuttings? At what temperature does the automatic mist
system turn on?
Mike Creel, SC USDA Zone 8a
Nature is my Greenhouse
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