Oh hey there SS - for your "somwhat" yellowing plants you have going you can do a Alfalfa (meal) tea. I was just doing some reading. The Alfalfa tea and foiler is a good one. I almost forgot about it... been using it in my soil mixes and our composting.
I was reading about some statistics on yields with Alfalfa tea added... its not subtle.
I almost forgot about this... the below was a study on rhododendron at Virginia Tech... if it works for rhododendron...
The treatment was a foiler spray of alfalfa meal tea (triacontanol)
TYPE OF MEASUREMENT CONTROL PLANTS PLANTS TREATED 5 TIMES INCREASE
Total Weight (minus soil)............30.2 g....................83.1 g.........................275%
Diameter of trunk at base..........4.0 mm..................8.0mm........................100%
Number of branches..................4...........................10..............................150%
Number of leaves.....................62..........................167............................269%
Number of flower buds...............4...........................8...............................100%
I was reading about some statistics on yields with Alfalfa tea added... its not subtle.
I almost forgot about this... the below was a study on rhododendron at Virginia Tech... if it works for rhododendron...
The treatment was a foiler spray of alfalfa meal tea (triacontanol)
TYPE OF MEASUREMENT CONTROL PLANTS PLANTS TREATED 5 TIMES INCREASE
Total Weight (minus soil)............30.2 g....................83.1 g.........................275%
Diameter of trunk at base..........4.0 mm..................8.0mm........................100%
Number of branches..................4...........................10..............................150%
Number of leaves.....................62..........................167............................269%
Number of flower buds...............4...........................8...............................100%