by Mike Atkinson (July 2011, updated May 2014)
For whatever reason, one challenge we faced in plumeria propogation was finding a reliable rooting method. We've tried just about everything and our success ratio was pathetic, well under 50%. We think a lot of it has to do with our hot, arid microclimate, but I'm sure there was also operator error involved.Then I was introduced to bag rooting and have achieved success well beyond my imagination. I'm now successfully rooting well more than 90% of my cuttings.
DISCLAIMER: There are many ways to bag root. People much smarter than I do it many different ways. I've tried many of those ways--some worked okay and some not. I'm not saying my way is the only correct way; only that it's worked best for me. You'll need to test it for yourself.
CAUTION: The brass ring in plumeria rooting is speed - everyone wants the fastest way possible. I cannot say that bag rooting is the fastest method. I've had some root in 2-3 weeks. Most are around 6-10 weeks. Some have gone as long as 6 months before rooting. (I actually had one take one year!)
All that to say that there are many factors in rooting plumeria: Age and condition of the cutting, vitality of the mother plant, variety, etc. I'm not sure there are any scientific studies to prove which method is fastest, because of all these variables.
I'm looking more for reliability/success than speed, and that's what bag rooting has delivered.
Possible rooting mediums:
What has worked best for me is coir and pumice. I've tested it against the other mediums and it's is faster and the most consistent. Plus I believe the quality of roots is better. When unbagging, it doesn't crumble as easily as the others.
TIP: You can add liquid rooting hormone to the water you use to soak the coir.
I tried rooting in multiple environments (greenhouse, heating mat, outside, garage) and all the cuttings rooted just fine. The heating mat cuttings rooted first, then the greenhouse, then the outside cuttings. I've also spoken to people who have placed them in totally dark garages, in attics, laundry rooms, and offices.
To rehydrate I use a simple turkey syringe (example) you can get at most grocery stores inexpensively. I fill it with water and inject about half of the contents into each dried-out bag.
TIP: You can add liquid rooting hormone to the water.
CAUTION: When inserting the syringe, be careful not to poke the cutting. (Yeah, I've done it plenty of times.)
Please feel free to send me any questions, comments, tips, ideas, gripes, etc.: firstname.lastname@example.org
Additional note: Another use for bag rooting is in shipping cuttings. Bag rooting them before shipping will help to keep them hydrated during the shipping process.
February 2011: Cuttings from Hawaii (November 2010) that rooted over the winter on heating mats and a covered rooting table
Rooting table: I fit up to 400 cuttings in a space that would only take less than 75 one-gallon pots.
Rooting Cuttings >