Eino Kenttä wrote:Thank you Arthur for the excellent tutorial! How did the grafts do?
I'm about to do this, will try my hand at nurse-grafting apples onto some random rowan seedlings I dug up...
My pleasure, Eino!
Im glad somebody is finding the info useful. Thanks for commenting. It is nice to see this post again and being reminded of the trials from last year.
Long story short …most of my purchased grafts ended up failing, while at the same time I took scions from our own trees, and 90% of those succeeded. I was very confused about what might have gone wrong, and I ended up being quick to quietly point the finger at the person who supplied the scion wood. I didn't make a fuss about it, though, and went more into a reflective mode with closer observations, and eventually realized that it was probably my own dang fault.
There were some differences between the unsuccessful grafts I purchased and the successful ones that I transferred from one tree to another.
The Failed Grafts
I believe that
the main mistakes I made with the purchased scions were:
[b]Grafting onto lower and thinner diameter branches on the trees, and out further from the main trunk. [/b] I was trying to match same size diameters to each each other mostly using a whip-and-tongue method. This also proved to be more time consuming, and I ended up with bleeding fingers more times than I care to admit.
Not cutting off the plastic wrap from the graft joints after a couple of months. I waited until this year to do so, and realized that this caused a tourniquet type effect. I wrapped the grafts very tight, and some ended up showing a clear bottle-neck shape.
Not helping to re-direct the sap-flow/energy into grafted areas. I mostly left these to be after i was done, rather than coming back later to pick off new shoots on the tree being grafted onto. I have read that trees tend to favor their own branches, rather than grafted branches, which tends to take away energy from the grafts.
The Successful Grafts
Attached to larger diameter wood. The method I used was mostly the
bark or rind graft, or
framework grafting, where multiple smaller diameter scions can be attached to the end of a larger diameter cut ends of scaffold limbs.
The tree I chose was a much older healthy tree that had apples of spitting quality. I decided to take a
pollarding approach, where all the main upper branches were cut back to stumps. I was really trying to keep the cuts no larger than the diameter of a golf-ball size, as to minimize stress on the tree and prevent infections and future disease issues. A smaller diameter wound heals more quickly and easily.
I cut vertical slits in the sides of the branches (between 2-4, depending on the thickness), and slid the wedge shaped scions under the bark layer, making sure to connect as much cambium as possible from the tree to exposed cambium of the scion. 90% of the grafts i did like this succeeded. The cut end of the branch ended up with multiple points where healing could happen more quickly. This creates
greater callus formation, or healing tissue around the graft unions.
This year I went back and delicately pruned off unwanted new growth, which was crossing or going in unfavorable directions. Next year I will likely be choosing which of the grafts to keep, and which to cut off completely as to minimize crowding. Many of these trimmings will likely offer source material for new scions to graft elsewhere, or to share and exchange with friends.
Here is an image from SkillCults website, which shows what most of my successful grafts looked like, and what I am mostly doing this year:
What I feel I did correctly overall that can help with successful grafting.
Sourcing scionwood at the right time of year. For me this was late winter, while the trees were in a dormant state. On my own trees I chose straight branches that were from the previous years growth, which had more space between buds. They were “waterspout” type branches that grow straight up and create long whips. I found that it was easier to graft with straight and uniformly round material.
Storing the scions properly. I did this by cutting them into lengths slightly shorter than the width of a larger plastic ziplock freezer type bag, placing them inside, adding fresh wood shavings that were dampened, but not wet, and then taking as much air out of the bags as possible before sealing shut. These bags were stored in a cool and dark place. Supposedly scions that experience warmth or receive light can begin to wake up. We want them to stay in a hibernation mode until after they have been attached to the trees, or rootstocks.
Waiting until sap flow to begin grafting. While some people were saying it is time to graft, I waited patiently and observed my trees to tell me when it was time. As soon as I saw the buds begin to swell I knew that the sap was now flowing, and that the grafts would get the juices needed to keep them going without drying out.
Protecting the grafts by coating with a graft sealer/wax, which of course was the whole reason why i created this topic. While some respondents in the comments say it is not necessary to do this, I still choose to take the precautionary approach and take this extra step, until later experiences and experiments will help me to prove to myself otherwise. Because there are some wonderful people commenting that seem to know what they are talking about I think there is good reason to believe that this step could actually be eliminated in the right context.
What I’m doing differently this year.
Choosing the right trees for framework and top work, in a graft-and-restore approach, while taking extra steps to improve the soil around them. This info might be best left for a separate post, or a new topic. This reply is getting long as it is…haha.
Removing competing growth from the rootstock tree early on.
Making sure to cut off plastic wrap in a couple of months time.
Using a store bought tree seal to cover the grafts with. I didn’t have enough time this year to make my own, and I had way too many grafts to deal with (41 new varieties), so I needed a more convenient quick fix solution. Again, I do wonder if this step is even necessary?
I hope this helps you Eino, and anybody else coming back to read through the material in the future!
Maybe one of us, or somebody in the Permies community, can remember to bump this thread before scion gathering season begins in Winter, and maybe some seasoned grafting experts will be willing to chime in and offer their own thoughts at some point as well.