having problem with plants

the bottom of my plants look like there dying the leaves r turning brown and falling off ad it is getting igh up to plant please someone help

How old are they?
What are you feeding them?
What kind of growing medium?
That should help a little...

the r about 4 5months old they r my mothers
they are growing in fox farm ocean forest soil
they r fed the flora series
floramicro
floragro
Diamond Nectar

they have been fine now they just started about 2 weeks ago or so i will post pic later today