The most common causes of seeds not germinating are:
1. Soil was too heavy (Clay).
2. Soil was allowed to dry out. (Only once is enough to kill the emerging seed)
3. Seeds were not given enough time to germinate before sower gave up. (Many seeds
have slow or erratic germination.)
The most common causes of seedling loss are:
1. Damping off, caused by over watering or fungi.
2. Using containers that don't hold enough soil. (Containers need to be at least 6cm deep and
filled to the top with seed-raise mix.)
3. Using potting mix, common garden soil, or previously used soil. (It's best to start fresh
each time to avoid fungi, etc.)
4. Insufficient air circulation.
5. Planting in previously used containers that were not properly cleaned. (Wash containers in
a solution of 1 part bleach to 10 parts water before re-using.)
6. Overcrowding. If you've planted too many seeds and they're all competing for space and resources.
7. Introducing seedlings to full sun or outdoor conditions too quickly (not "hardening off")