Inexpensive silica can be had at Amazon or most grow shops in the form of potassium silicate. That would be something like Pro-Tekt from Dynagrow or Armor Si from General Hydroponics among other brands. Keep in mind that they tend to be 0-0-4 so will add to the potassium you're already feeding them with the PB nute line. We do see K toxicities on a somewhat regular basis here from "bloom boosters" so be careful with it.
On the other hand, I doubt that any silica at this point will keep them from breaking in the wind. I'd go with tying them to stakes hammered into the ground and maybe even a net like Otter outlined here.
On the other hand, I doubt that any silica at this point will keep them from breaking in the wind. I'd go with tying them to stakes hammered into the ground and maybe even a net like Otter outlined here.
. 
Another beautiful day with lots of sunshine. My plants are doing pretty good. The one sour diesel that is light green and yellowing at the bottom and up the middle is looking better. The extra nitrogen is working the green ins getting darker and the yellowing leaves are changing with yellow leaves getting darker. The apple fritter is putting out more pistils. If we could keep this weather my plants would keep on getting bigger. The sour diesels are still stretching, and the topped sour diesel is 5ft 4 inches.
Grew out a few of them and the DTF. Solid f-n gear
