Hi, Brian, There are many reasons why seeds do not germinate: too much or too little moisture, too high or too low temperature, oxygen (for example, too much water can hamper the amount of oxygen available), light (some plants like a lot and some like less; the amound of light a seed gets be affected by the depth at which it is planted); the medium into which a seed is planted. Different seeds may have slightly, or greatly varying, needs of all of these conditions. And, most seed suppliers know that very few varieties have 100% germination; that's why you get lots of seeds in packets. Some of your best guidance is on the seed packet.
All we can suggest is that you review/reconsider the needs of the specific varieties and see if you can better fulfill their needs.
Hi, Brian, There are many reasons why seeds do not germinate: too much or too little moisture, too high or too low temperature, oxygen (for example, too much water can hamper the amount of oxygen available), light (some plants like a lot and some like less; the amound of light a seed gets be affected by the depth at which it is planted); the medium into which a seed is planted. Different seeds may have slightly, or greatly varying, needs of all of these conditions. And, most seed suppliers know that very few varieties have 100% germination; that's why you get lots of seeds in packets. Some of your best guidance is on the seed packet.
All we can suggest is that you review/reconsider the needs of the specific varieties and see if you can better fulfill their needs.