You might suspect that, with all these repotting posts, it might be time for you to start to repot your trees. It happens to be the first week of February here in sunny Orlando. My USDA zone is 9a/b (I actually have microclimates in my yard that can be several degrees warmer that the rest of the yard,hence the a/b part. I think these spots might lie over an old septic drain field.)
Right now, in New England, there is a blizzard occurring. It’s gonna be 80 degrees Fahrenheit today (which is 26.666 Celsius). It’s been a warm winter and an early spring.
So please don’t use the timing I use for your plants.
Anyway, this post is also an update on this story.
And this tree
The background. I had gotten the tree at last years (2012) Joy of Bonsai (Kawa Bonsai Society) from Smitty’s Bonsai.
I reduced it down from a big nursery can into the training pot it is in and, in August of last year, did the initial work on it.
Here it is today.
I chose to carve it when I did because, in Florida, we have a heat induced dormancy in July/August and its best to carve when it’s dormant and its likely to cause the least harm. IMO (IMO is textspeak for “in my opinion”. Kinda like OMG is “open my gauntlet” which is a universal gesture of showing that you are unarmed)
First step is to remove last years old leaves, and cut off any branch dieback.
at the bud just above my thumb, I will achieve the same thing. It’s very simple.
If you wish the branch to go left (or right or up etc) just cut the branch back to the bud facing left.
Lets see about repotting…..is the tree ready?
I would say yes.
Time to dispel a common myth.
I’ve heard many people say that trimming the roots is what we do to dwarf the tree (I’ve heard the opposite as well, that keeping them root bound does the same thing. There is truth to that one. But it’s easy to kill the tree that way too.)
The reason why we repot is to give the tree space to grow and the keep the feeder roots close to the trunk.
Think of a tree like it is a drinking straw; (this is very simplified so if you wish to “correct ” me, please do. We all want to know the breadth and depth of your knowledge….) try this- place a straw in a drink and blow over the top of the straw at the opening. The liquid (hopefully its a margarita or daiquiri, I could use one about now) will rise to the top of the straw. This is how the tree transports water from the roots to the leaves (like I said, very basically, most readers don’t care about differential barometric pressures and viscosities and such. I just gave my readers an excuse to drink an adult beverage through a straw. I know someone will say “that’s not right, it’s this way…waaa. Go easy on me).
By keeping the roots closer to the trunk, we make this process (called transpiration) easier for the tree.
And, by trimming the roots (freeing up space in the pot) we give the tree space to grow, thereby improving the overall growth rate of the tree. If its not growing its dying (unless its winter I guess.)
At what time of the year do we repot?
It is different for each tree.
A deciduous tree (like this hornbeam) I repot just before or as the leaf buds are swelling. The reason is, this is when the roots begin to swell and start putting out new feeder roots (the only ones that matter. The big chunky roots provide no purpose except stability) and repotting at this time allows us to take advantage of the trees timing and not waste the plants energy by forming new roots twice (if we repotted too late) or of the cut ends rotting because transpiration is not occurring yet, moving water upward (repotting too early). Capice?
Usually it’s best to prepare the pot ahead of time but if you’re reusing the same pot (we don’t generally up pot trees. Repotting usually means maintaining the tree in the same pot) put your tree into a pan of water. If the roots dry they will probably die. (I was not smart and I didn’t pre-prepare my pot. )
Since I’m putting this into a new pot I will have to prepare it. Here are some shots of the deadwood to help you pass the time while I do that.
Plastic screen to keep the soil in (use plastic canvas from The Walmart. Cheaper than that official stuff) and wire to keep the tree from falling out of the pot (I have cats and children)
And put the tree in, backfill with new soil etc (I don’t want to repeat myself too much, please browse the previous posts for more of the technique)