A flower that blooms is evidence of good roots. That is not to say solely its physical roots in and of themselves, but also the conditions which foster and promote the growth of healthy roots. For example, the right balance of phosphorus, nitrogen, and potassium in the soil. This so as to provide optimal conditions of the roots to grow and plant to thrive.
There are three things characteristic of a plant with roots. First, they are physically planted. This means they don’t have much choice on whether or not they come into existence, they simply exist because a seed was planted by someone else—or is consequential of some thing, such as wind pollination—at some point in time. Second, they are figuratively planted. Meaning they are destined to an appointed time and place, and cannot be easily moved from point a to point b—unless point b becomes a right place at an appointed time. A simple example is transplanting a tomato vine to the outdoors in a city with relatively low seasonal temperatures. It can technically be done in any season. But if it is not the right season, the fruit may dry up or grow stunted. Or, at worst, die.
Third, plants with roots are nourished. The degree to which a plant is nourished is highly variable and not solely dependent on being fed. It matters which nutrients the plant was fed (if any) under which conditions, how frequently, and how consistently, among other considerations.
It is also worth mentioning how deep or shallow the roots are. Water is more likely to settle deeper into the soil whereas shallow soil is much drier. Hence, deeper roots best allow plants to stay hydrated even in times of drought. Not to mention deep roots better allow plants to stand the test of time in most aspects relating to environmental conditions: storms, shortage of water supply, shortage of food, inability to thrive in current (temporary) conditions, attack by weeds, disturbance by foreign organisms, etc.
Though, can a plant with shallow roots thrive? Of course it can, but the likelihood noticeably drops. The parable of the sower shows us the importance of geographical location, divine appointment, and nourishment to growth.
If a radiant bloom is evidence of (good) roots, to some capacity, then roots are evidence of (the potential of) a beautiful life cycle. More than that, they are witness to the (limitless) potential of what can be fearfully and wonderfully made in nature.