Because the rooting of various plants can be such a fine activity to engage oneself.
I had a flourishing deep purple African Violet that I decided to divide back in the spring, and while I was at it the delight of rooting the leaves seemed appealing too. Now this is no quick form of gratification. Only those who can wait and wait and wait will gain the total joy of seeing those little leaves emerge from the rich soil and feel those little buttlerflies of happiness inside. Maybe it is because of my age, and experience has certainly had its imprint, but I have discovered that those things that we must wait for possess such an essence of very sustainable happiness.
Which reminds of what the prophet Isaiah said,
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.
Isaiah 40:31