Allah says in Surat-ul-'Abasa:
|Then let mankind look at his food -|
|How We poured down water in torrents,|
|Then We broke open the earth, splitting [it with sprouts],|
|And caused to grow within it grain|
We plant -> we purify our intentions -> we ask Allah to grow the plants -> our du'a are accepted-> Allah grows our food -> provides us with plants for nourishment and healing illnesses -> provides life giving oxygen and purifies the air we breathe -> provides different balancing minerals and nutrients to the earth -> we thrive on it -> are able to worship Allah -> and purify our intentions....
It is a cycle of purifying perfection, al hamdul'Illahi Rabbil aal ameen!