We can see the answer in a picture of gardening. If you want a flourishing garden, you need to tend to the soil, even bring in manure. You must tend to the dirt and get nutrients to the roots. If you are dealing with weeds, it is not enough to cut them off at the top and hope they go away. You have to dig down deep into the soil to extract the roots and kill what will diminish your crop. It is messy, dirty work, but the result of good care and wisdom is delicious, nourishing fruit.
