In the past, seeds were started in peat pot or plastic trays. Success was usually pretty good at first, and then seedlings would take a nose dive. After reading more into seed starting, the general consensus is that seedling roots hit the plastic walls and stop growing.With peat pots, the roots usually did not penetrate the pot very well and also stopped growing. A soil block is just soil, it is supposed to help air reach roots on all sides and allow seedlings to get in the ground running.
The plunger is depressed and the row of soil blocks are placed in a flat.
I am standing next to the mini greenhouse wearing my usual gardening outfit-well pretty much my usual outfit.
In case you wonder what Erik does out in the garden, he made me this garden bed for Valentines day: