Organic ferts have something to them but i dont think sallies are that demanding and do just fine on your average plant fert product.
They are also relatively tolerant to underfertilization i would say from fun experiments like growing a cutting from a wine bottle with water that i didnt refresh for months - so yeah a fortunate microbial situation apparently in that water
Yes plants need different levels of different nutrients in different stages of their growth/life, I honestly don't know of any data that suggests which nutrients can "boost" SD but that would be good to know. Don't go nuts with exotic nutrients imo unless you really know what you're doing, adverse things might happen.