germinate
To start growing from a seed into a new plant.
When a seed germinates, it begins to grow into a new plant. The hard seed coat softens, a tiny root pushes down into the soil, and a small shoot reaches up toward the light. You can watch seeds germinate by placing bean seeds on a damp paper towel: after a few days, you'll see that first root emerge, followed by a delicate stem.
Germination happens when conditions are just right. Seeds need the right amount of water, warmth, and sometimes light to break their dormancy and start growing. A seed might sit unchanged in the soil for weeks or months, waiting. Then, when spring rains come and temperatures rise, it suddenly germinates and begins its transformation into a plant.
The word also describes the beginning of ideas. When someone says an idea is germinating in their mind, they mean it's just starting to take shape and grow. Like a seed, the idea needs time and the right conditions before it fully develops into something you can use or share.