[philipraposo1982]

is too deep bad? or too shallow bad?

 

[Bryanmc1988]

shallow is not bad its just not enough room for roots to hold it self down ...

i would say about 1" to 1-1/2 " of substrate is good enough

 

[SmellsFishy]

I'd say about an inch should do it. When I up-root dwarf sag for trimming, I never see roots longer than 1"