temperature for getting cuttings to root
I have read everything I can find, and normally they say you need 70 F at the root zone for a cutting to root.
But yet, someone on the fig forum had a cutting in their fridge for 2 weeks at 37 F, and it formed a nice callus!
So is the 70 F just an urban legend or myth.
Reason for the question: at 70 F, my rose cuttings start getting yellow discoloration of the leaves by day 7, and by day 14 the leaves fall off, and then game over. I managed to get my last batch to root at 30% success, by daily spraying with antifungal.
So, last week-end, temperatures are getting colder, so I prepared 3 dozen cuttings, to be kept in the garage, under bright fluorescent lights - temperature there is 46 - 54 F.
I sprayed all the foliage once with anti-fungal, and so far,
6 days later, foliage color is perfect.
Any predictions, anyone like to place any wager, regarding what the success or failure will be?
p.s. this last set of cuttings are semi-ripe, all leaf-bud, or what I call the Advanced Burrito Modification - 2 nodes, with one leaf, using gel rooting solution, and organic leaf-compost/hardwood bark/peat medium enriched with worm castings, just damp, not wet. and the entire stem is buried, with just the leaf sticking up out of the compost, covered with the 7" humididome, and one inch from the fluorescent 32W x 2 light, which (of course) is overdriven to 54W x 2.