Hey guys, first post here. This is kind of a row part question. First of all, I have 7-8 juniper I started preparing for a yamadori project this month, about 5-6 months ago. I dug around them hopefully forcing new, closer root growth, and I fertilized a couple times to gain strength.
I am in Southwest Florida and we have had a warmer winter than normal. We have had some cold days and nights, but then it just goes right back into the 70s and 80s. I have been looking forward to starting to work on these trees for a while now. I know that the shorter photo period has a lot to do with their dormancy as well, but the weather doesn’t seem quite right yet.
Should I wait until it gets colder, if it does, and if it doesn’t, then what?
Also, I watched the ‘yamadori aftercare’ video with Randy Knight, and he speaks highly of using coarse sawdust for his fresh yamadori. I was able to get my hands on a big bag of the stuff from a local lumber yard. I am wondering if I should use this sawdust as a sole growing medium for the first season or two, and if so, should I be concerned about pressure treating chemicals and/or natural oils from different types of woods such as rosewood?
I have read that the small amounts of copper based chemicals used these days in treated lumber is very safe, even for vegetable gardens designed for human consumption. I also would imagine that 99% of grow boxes being made by bonsai enthusiast are made from pressure treated wood as well, and never given a second thought. However, that is not using it as a substrate.
I am anxious to hear what you all have to say regarding both the proper timing and and the use of sawdust.
Thanks so much for reading and responding!!