Why GTs slow growing, fat, stubby

I am just a beginner but I have some B+ growing in the same conditions that are thriving! These GTs however are half the size of my b+ ,even tho the GT
Colonized way before them and I initiated the fruiting stage on these first. They won’t colonize the middle I’m at a loss…..

u/Flashy-Fix-5353 — 3 days ago