Understanding Seed Germination: From Dormancy to Sprouting

Many plants begin life as seeds (exceptions: ferns and mosses from spores; plants from cuttings or asexual reproduction). A seed contains a rudimentary plant (embryo) and a food supply to start growth and feed the seedling until photosynthesis begins. Some seeds are viable briefly; others remain sound for years or even centuries, ensuring species survival.

Seeds germinate only when favorable conditions are met: adequate moisture, preferred temperature, and for most species, loose-textured soil providing oxygen. Gardeners supply these via potting mixes or prepared seedbeds.

Some seeds have additional requirements. For example, cold-winter plants sprout in spring after winter; to enforce this delay, seeds need moistening then a cold period (stratification). Gardeners mimic this by placing seeds between damp paper towels in a plastic bag in the refrigerator for 1-2 months. Other seeds need nicking, grinding, or scarifying to break hard coats; some require light, darkness, or even intense heat.

Seed size varies widely—from coconut palms down to dustlike begonia seeds. Size correlates with stored food and thus maximum planting depth. Small seeds have small reserves; if planted too deep, they exhaust food before cotyledons reach the surface. Seed packets give depth directions. Rule of thumb: bury a seed no deeper than its length.