Roots must go deep to establish depth. They must wind down and through watering and being fed in order to reach a place that is rich and life-giving.
I want to establish such roots for my children as they grow up in my home. My home is the pot and I must fill it with rich soil in order for them to have a good beginning. To keep them growing, they must be fed life-giving water so they don't dry, wither, and cease to thrive.
The living water is Christ,the food is His word, and the sun His strength. Establishing deep roots is to establish deep faith; deep relationship with God. One not easily swayed by the world and it's lusts.