Over the past few days, I've noticed that LECA, in larger amounts, is less pH neutral than I'd anticipated. Over-night runoff in the mostly-LECA Albert Walker BX1 bucket was approaching 7.5 pH, with a morning input of 5.5-6.2.
I figured I'd just flush it out, and it seems to be working, because runoff was about 6.5 this morning. Whatever was causing the pH rise is probably mostly neutralized by now, so when I check tomorrow I'm expecting about 6.1 runoff.
Perlite did the exact same thing, though.
And both perlite and LECA are supposed to be pH neutral. Inert, maybe, but certainly not neutral out of the bag.
Residual hydroxides on the media from manufacturing? New source material? I can only speculate.
Oddly enough, the rockwool cubes have been the most pH neutral media I've used so far. Odder still, several people reported the Plant-!t brand caused pH drop, all the way into the middle-3's.
It would seem most media has consistency issues.
Here's the Albert Walker BX1. I'm going to start referring to it as "Delbert Walker":
Osage Orange, also doing well:
This plant is 6" tall and has at least 10 nodes. It's been bonsai'd, stems crushed and intensely defoliated to keep it small until I needed it.
It's been about 7 weeks from when this cut rooted.
I originally had 3 clones of Osage growing in the same polystyrene cup. It's amazing what limited rootspace can do to keep a plant small.
Now that the other 2 clones are gone from that cup, the main Osage Orange mother is rapidly increasing in size.
Here's the moms n' clones bucket:
Clockwise, from bottom left: Osage Orange, A13, Prayer Tower, Delbert Walker.
After this run, I'll pare it down to 3 strains so I have some space to start cracking some beans.
It's going to be a difficult choice to make, I like them all...