Ottawan,
what i have noticed particulary this year as i have some small plants that have grown this season .
Potting soil varies , miracle grow, shultz premium, and upm all mixed with some perlite and small bark with lime, its what i had i used .
Negretta, Ischia Black, Madeira, Pastiliere, Argentile a stubborn plant, all grow slow and get about the same fertilizer except Ischia which gets really "nuked" hard but what i notice is these slow growers have the closest nodes out of my plants, i fertilize them everytime i water with full dose except Ischia which get more than a full dose , the nodes are super close maybe because of the slow growth i think but i try to make them grow better with all the fertilizer.
My other small ones that took off like a bean plant right from the time i recieved them Ronde and Dark Portuguese have a big distance between nodes yet they get the same fertilizer as the above ones but these plants are just vigorous growers for me. It seems some types grow faster and hardier than others and these 2 fall into the catagory for sure.
For instance i recieved Pastiliere and Ronde in a 4 inch pot small healthy plants around May 16 both similar size, i just went out and measure them, Ronde is 32 inches tall and Pastiliere is 8 inch tall, Ronde has nodes a mile apart and Pastiliere has nodes very close together both same pots and fertilizer.
Now i slow down the fertilizer as season is getting older, but i always give them the water they need right until there dormant and then a real small drink in winter if they need it. When the cold hits as you know BOOM the leaves turn yellow fast what seems like overnight and lose there leaves soon after they go to a daydream sleep , when the real cold hits after there in garage they are in deep sleep and wont wake up till its there time.
I did the same thing with my older plants when they were young, following year i will give weaker solution of fertilizer like my older plants except for the stubborn ones.
Im not saying at all what i do is the right way or anything its just what i do to get my plants a good start when there young for me. Take what i do with a grain of salt as these are just my experience . In hind site should i have gave Dark Portuguese and Ronde less fertilizer PROBABLY but thats ok there healthy and forgiving and im thinking next season i should get some figs to taste from these plants . Waiting to take daughter to band camp so i babbled on here!
Best Health