Plants, given the right conditions, undergoa natural pattern of growth. Over time, it begins to root itself in the soil. Going deeper and deeper until it becomes established. 
There is a link between rooting and establishing;  no roots no establishing. With deep roots the plant becomes established and flourishes. We see only what is happening above the surface and not below.

No wonder Paul prayed for the Christians in Ephesus – they were going to need lots of it – as they sought to become rooted and established in the love of God and the shared love with those around them.