So, my own testimony with this stuff FWIW:
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When I was first starting out, I couldn’t wait the year, and I wanted to inoculate leaf-bath with it, so I bought some online. It didn’t work wonders. Judging by CSU’s Registry (has since been taken down apparently), though, NO ONE LIKES TO FOLLOW INSTRUCTIONS, so, in addition to the science shared in the presentation, I was not deterred.
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I found a pocket of the clay-like compost in my composter (the rest was too dry, and/or not the right substrate, at the time), and applied it with some mixed results:
A. Pine : The Pine in the front yard basically immediately stopped being preyed upon by aphids–you can tell bc car windshield wasn’t being drenched–and, within a week, or so, the car windshield wasn’t showing new spots.
B. Trumpet Vines: Three Trumpet Vines grow on the West side, and, bc of shade (Pines shade the until midday–there’s one that’s been large, then a medium, then a tiny, depending on how much shade they’ve gotten), only one has had enough energy to grow to where it can get Sun later in the day (after Sun has passed to the other side of the fence), so only it has produced flowers… the first year I gave them BEAM compost, they ALL produced flowers, and the bigger one that has always produced flowers produced them like never before (5 here, 7 there-- dozens and dozens), and we had lots and lots of hummingbird visitors on account of this, and the neighbors enjoyed it all!
C. Blackberries: I can’t say for sure, but I’d find it hard to believe if I didn’t apply it to the Blackberries, yet I saw basically no difference… Now, the difference is these get a lot more Sun (both Pine and Trumpet Vine soils “enjoy” a lot more shade), and are a lot more thirsty by nature, and I’m still learning how thirsty these guys can be even during Winter. I had them dry up on me during two Winters, already, so I was very diligent about watering them this Winter. We’ll see what the fruit does this time. Actually, I think there was a difference–a very noticeable uptick in flower production, but I still remember not being happy with fruit production (maybe because I just kept thinking about all the floricane length that had died that Winter from underwatering).
D. Apricot: in past times, I just remember a lot of these flowers falling off when I have gone to hand pollinate, but, this Spring, maybe one (out of a thousand?) fell off during pollination? There’s a different quality to them altogether. That said, they haven’t gotten TONS of care, so maybe a LITTLE care went a long way.
ALSO, the frost has basically killed all the hand pollinated flowers, so probably no fruit this year. We have to graft late blooming Apricot (eg, Hoyt Montrose) onto these branches.