I decided to fertilize with Miracle Grow 24-8-16 because some of my plants were stunted and not growing like the ones on the right of your pic. They turn a pale green yellow and eventually stopped growing, even though they were planted in the exact same soil as my Cascade that grew like a monster.
Brought them right back to life and now they are at the top of their 20' run and springing burrs.
On smaller plants i'd start with half Tbps in a gallon of water per plant.