What varies for all seeds in relation to growth?

The temperature is a critical factor that influences seed growth and germination across various species. Each type of seed has an optimal temperature range that is ideal for germination. When temperatures fall below or rise above these levels, it can adversely affect the seed's ability to absorb moisture, initiate metabolic processes, and ultimately sprout.

Seeds respond differently to temperature changes, influencing the timing of germination. Some seeds require specific temperature cues to break dormancy, while others may germinate rapidly under warmer conditions. Therefore, understanding temperature's role is essential for successful planting and achieving healthy growth outcomes in horticulture.

Moisture level, depth of planting, and soil type, while important for seed growth, do not have the same degree of variability across seeds as temperature does. Different seed types might have similar moisture needs, planting depth preferences, or requirements for soil composition, but temperature is the one factor that has the most diverse range of optimal requirements depending on the seed type.