transplanting from bad soil to good

anyway after analyzing what could be keeping my plants so small ive come to the conclusion its gotta be the soil. im not going to go into specifics why i think that , but thats what i think. anyway im wondering how can i transplant from this bad soil to good soil? i obviously want to get as little as the bad soil in the new pot as possible. so how do i go about not destroying my plants while getting them in new soil.thanks in advance

dje...

How rooted are they? Will they come out of the container and stay in a solid mass..or will the soil all fall away leaving bare roots?

What was the old soil..what is the new/better soil?

more info would help!

bt dt

im not sure how rooted they are. when i transplanted from cups to 1 gallon pots there wasnt much of a root ball. much of the soil fell away unless i watered before pulling them out of the cups. the old soil was a general purpose potting soil with no added nutes mixed with perlite. i think the soil was bad first off because there is small bark and stuff in it and i dont think i added enough perlite. the new soil will either be fox farm ocean forest or a custom mix found online. so should i water before translplanting or should i have them fairly dry and try to loose as much soil as possible off the roots before putting in new soil?

na just go with a bigger wider,deeper pot,,
careful about how much soil you shake free ..I really wouldnt shake ...there already going to go through a stunt for a week or two,,if you transplant. no need to stress her further..
Its not hard to reuse soil either ad a little compost..its spent you can adjust to your own pref..
get a ppm and ph and soil probe and adjust

you also will want to use a root stimulator with transplant n-p-k 5-10-5 it will absolutly help w/root developement