Why is it difficult for roast to grow in concrete?

Thus the growing up from the crack in the concrete was quite difficult for the rose and symbolically growing up from the ghettos was quite difficult for the poet and would be difficult for others as well. Lines 3-4. The rose has proven nature's law is wrong. Nature's law here means the way rose should have existed i. e. it needs soil, air, sunlight, moisture, etc for existence.