Very unorthodox! Not recommended and probably would not work in most areas. It works for me so I have no choice but to keep on keeping on.
It started about 2 years ago when I had several newly grafted mango trees and a had to find immediate shelter to keep them alive during a cold front moving in. So being the procrastinator that I am since retirement, I had very little time to build a shelter(4+ hours). This is embarrising but worth a few laughs, my makeshift greenhouse.
It's okay to laugh, but it saved all my mango trees and now they are large enough to withstand mild frosts of an hour or two. So being the lazy person that I have become, I decided not to tear it down, justified by using it for rooting cuttings, please understand that after losing dozens, maybe hundreds of cuttings from mold, gnats, rot, etc... I only root in one gallon pots, at least 60% pine bark fines and the rest...potting soil/peat, perlite, mulch/compost. I root cuttings no matter what the outside temps are and will give some information with later photos.
Many of these trees were rooted during the months of March-November, no altering of the temperatures since all my cutting are rooting outside in my .......greenhouse/shack?? These are from March-November 2013, several were rooted Nov. 2013-mar. 2014(without heat), some are from 2012. All are 3 gallon or larger.
Several of the trees are starting to wake up, yes even in South Florida fig trees take a short nap.
Now, inside the errrrrrrr greenhouse I have cuttings in different stages of growth. Some were started in December 2014, Jan 2015, Feb 2015 and the cuttings without leaves are recently potted in March. Again, we had nights as low as 38 degrees and most nights were in the 40-65 range. Daytime temps were between 50-85 degrees. No heat was provided until one night that reached 31 and I put the grill in the enclosure and stoked up some briquettes and was able to manage a temp of 41. Crazy right, but it worked for me. Here are some of the results so far, and only a handful of cuttings were lost but I knew ahead of time I would lose them, very unhealthy. Take a look at the crude setup.
Not a pretty setup but the cuttings seem like to the environment. The CdDG are aggressive growers...14" and 2 at 12". What I am trying to impress upon growers is find YOUR method of rooting, what works for you is the best method. With all my other fruit trees and plants, I do not have time to mess around. These cuttings stay in the one gallon pots until November or maybe until next year. No messing around and no re-potting. Well, I guess I need to plan for tomorrow, let's see...work on mangoes, avocados, plums, peaches, persimmons, guava, longans, lychees, carambolas, bananas, blackberries, blueberries, mulberries, lemons, rio de grande cherries, and oh yes did I forget figs. Good luck and good growing members.