I've been repotting plants longer than I can remember (since childhood). I sat down and repotted half a dozen little trees today and decided I'd take notes this time to share with others. I had several cuttings in cups which were showing roots around a vast majority of the cup, high and low, which is what I like to see, it helps to hold the soil into shape when removing, which results in (for me) less damage to the roots, if you are careful and considerate about your removal method.
First thing I like to do on repotting day is is get all of my new pots, labels, cuttings and soil ready. This means:
- Watering the cutting normally (maybe a smidge more than normal). I do this several minutes in advance from trying to remove it, or prior to the following steps so the water has plenty of time to spread out to every last little bit. This will help the soil adhere to itself, which will help it keep a nice cup-shaped form when removing it.
- As if this isn't obvious, I clean out the new pots that will hold my cuttings. You never know what may lurk in an old pot, or what was previously in it, especially if you're like me and you recycle your pots.
- I open my bag of soil and spray it with water, then mix it in so it has a nice moist texture, similar to a soft, airy, fluffy moist cake. This usually takes three or four shots of water, and working it waaaay down deep into the bag between sprays. This prevents me from needing to water for at least 2-3 days after transplant, so I *know* I'm not going to suffocate my roots by overwatering.
- For each pot I'm using, I will pre-fit my cutting by setting the cup in the pot and trying to figure out how much soil I should "pad" the bottom of the new pot with to get the right height. I will then put that much soil in, then work additional soils up the wall to create a hole in the center large enough to accept the cup. This is only possible if your soil is moderately moist as described in the last step.
Once I've performed the steps above, I'm pretty much ready for transferring cuttings. I have a few tricks and tips I can share on this one. These all work really well, even with the most well-rooted of cuttings in the most bizarre containers.
First thing I do is work the soil and roots away from the sides of the cup. I do this using a technique I picked up in massage school when I was younger, during reflexology classes. I grip the cup and "thumb walk" around the plastic. Before I say anymore, I will explain "thumb walking", it's an old technique which you can quickly pick up by watching this Youtube video:
I use this thumb-walk technique in circles around the perimeter of the cup, pushing a bit forward as I go so that a it almost keeps a "wave" or "rippple" in front of my thumb. This will separate any stubbrn roots from the side of the cup (assuming you watered beforehand). I work around the full perimeter of the base, then move up a quarter inch and do another full circle around the cup, then move up another quarter inch until I've walked circles from the base to the top rim. Once I get to the top rim, I like to push up on the bottom of the cup with both thumbs to coax the soil block up.
After this, I can usually flip the cup over, brace the top of the soil, and give a light tap with 1-2 fingers on the bottom of the cup, and the cutting, soil and rootball will normally pop out in one fell swoop. There is a certain danger involved. On 1 out of every 30-40 plants I do this with, depending on how the roots have set, sometimes the soil inside the cup will be stubborn and the top and bottom halves will separate, dumping the entire top half of the soil out. This happens most often when I don't thumb-walk the bottom of the cup firmly enough, or don't push up from the bottom with my thumbs, or when the bottom bit of soil is drier than the top (i.e. didn't water properly, or O didn't let it set long enough to distribute the water, or I failed to brace the cutting and top of the soil well enough, or maybe I smacked the bottom too hard).
In cases like that, or cases where the cutting just won't budge with , I break out a flat razor or Xacto knife and cut the rim on two sides opposite each other, then cut downward about halfway down the cup. This will give me some leverage to work something firm but flimsy (like a transparency sheet for an overhead projector) around the edges of the cup to really break the soil free.
If all else fails and my cutting won't come out, I cut the cup the rest of the way down and manually separate it from the soil block.
After the cutting and rootball is out, I direct-transfer it into the new pot, set it on top of the existing soil, and add new soil around it. I tamp down firmly like I would any other plant I'd pot, in the ground or a container. I add additional soil as required.
I spray the leaves lightly/rapidly afterwards to get any excess soil off, but not enough to actually water the plant - no need to water, since the soil used was already moist. And this could be complete BS, but I believe wetting the leaves helps hydrate them after the transplant, in case the roots are shocked or broken and won't allow as much uptake.
I put my plants in the shade, normally indoors (since I keep mine indoors throughout the process anyway) for monitoring. I monitor them every 30-60 minutes after transplant to look for leaf droop. Droopy leaves can mean any number of things, but on a transfer, I've found this normally means I snapped off a root or two, and the roots aren't uptaking enough moisture to support the leaves' needs.
It's important to address droopy leaves right away. Droopy leaves are usually related to root damage, too little moisture to the roots, excessive heat or insufficient humidity. Using the steps above to pre-wet my soil, droopy leaves are NEVER been a soil water issue for me. If you follow the suggestions above with regard to pre-wetting your soil, you should never, ever need to water your plant after transfer. Watering your plants after transplant can easily be a death sentence.
Likewise, by putting the plants in a shady spot indoors, excessive heat shouldn't be a problem. This leaves two other possibilities for droop (humidty or root breaking), which both have the same solution - misting the leaves lightly, or simply returning the cutting to an a clear storage bin for a couple days with the lid locked on.
I can normally confirm humidity/root break as the problem by misting the leaves lightly. If this helps to reverse droop within 30 minutes of spraying, this is a pretty solid confirmation to me, and I send the plant back to the bin. I've used this method on a number of plants that showed signs of limp leaves post-transplant, and it has worked the vast majority of the time. I do air out the bin nightly to help keep things fresh.
That's pretty much everything I do, in a nutshell. I figured I would post the details here in case it may help others. I like sharing details of my processes with other folks, and reading their processes, it helps to build a better process overall ;)