How Long Does It Take Seeds To Sprout Indoors. In most cases, seeds will germinate within three weeks (after that, try starting a new round of seeds). At this stage, the seed breaks open to form a root, then a stem, and then leaves, which can be called a seedling.
Once the seedlings have started to sprout, prop the dome cover up so that it is open. Leafy veggies such as lettuce, cilantro, etc. Within a couple of days to a couple of weeks, the seeds will germinate.
Germination rates will vary when you start seeds indoors based on the room temperature where your plants are kept.
Cucumbers are very sensitive to cold. A favorite place to keep seeds warm in order to germinate is on top of the refrigerator. Leafy veggies such as lettuce, cilantro, etc. How long does it take for seeds to sprout indoors?