You have to admire their tenacity. In a rock face,
or in a piece of driftwood,
a seed finds enough soil to sprout and grow.
How do seeds thrive in rock and other inhospitable substrates? There must be enough soil in the crevices to sustain them.
Seeds are on a mission. Propagate! Grow! And they do, in harsh circumstances where they hang on, even thrive, long enough to bloom and produce seeds.
Roots push into cracks and crevices and water gets in. The frost and freezing in the harsher months creates a bit more soil and the next year a few more seeds can sprout. Before long a patch of wildflowers is thriving.
Tenacity helps plants establish life in the most adverse circumstances.