The number of tomato seeds per hole depends on the size of the container or planting bed, as well as the expected germination rate of the seeds. Generally, it is recommended to plant two to three seeds per hole, and then thin the seedlings to one plant per hole once they have sprouted and grown to a size of 2-3 inches tall. This allows for some flexibility in case not all of the seeds germinate, and ensures that each plant has enough space to develop properly.
It is important to note that over-crowding the seeds can lead to weak and spindly seedlings that are more susceptible to disease and pest problems. Thinning the seedlings to the recommended spacing also helps promote good air circulation and allows each plant to receive adequate light, which is important for healthy growth and fruit production.
Under ideal conditions, tomato seeds take 6 to 11 days to germinate. The University of Maryland recommends that tomato seeds can germinate in as little as 5 days, while the University of Maine recommends that tomato seeds take up to 11 days to germinate.