Bloom
Hold on long enough and it flowers.
Each seed is a little recursive vine: it climbs, wobbles, occasionally forks, and when a branch runs out of energy it opens into a flower. Petal count, hue and curl are all rolled per seed, so no two presses give you the same plant.
Growth only happens while you hold on. Let go early and the stem pauses with a pale dot on the tip — press near that dot to pick the same plant back up and carry on. The flowers are the reward for staying put.