stock size and other questions

question i keep being asked by people that i got my seeds from but i have no clue what to tell them i just baby my babys but all my plants have a 3 inch round stock or more. and people keep asking me what i am doing to get my plants so big. other then feeding the plant and support why is having a huge stock impotent and looked at as such a cool thing. i always looked at it like the plant knows what it needs and if you give it what it can use it will grow the best it can. just wondering why my plants get to 6+ feet and tree looking main steams but the people i get cuttings and seeds from cant get there plants to stand up with out support like the biggest stock is not even the size of a pencil and cant even support the bud development. i use homemade compost and this year i added biobizz i can give them a bucket of my compost and still tiny plants can anyone help me understand this

Are they growing outdoor? 3 inch stalks are common outdoor. They are probably over feeding or over/under watering. Those mistakes cause the most problems. For indoor, inadequate lighting can also cause weak growth. Adding potassium silicate can also strengthen weak stems.

*Stalk*.. sorry to have to be that guy