Why do you use Agar gel instead of damp paper?
Seeds germinating on agar gel
The main problem with wetted paper is the tendency to dry out during the long incubation periods (often several weeks) that we frequently use in the germinating of wild plant seeds. Using agar means that we are able to supply reservoirs of water for a longer period.
Additional benefits are that seeds tend to take up water more gently from agar, reducing the risk of so-called imbibition injury, and that germination promoting chemicals such as nitrate or gibberellins can be easily incorporated.
Last, but not least, is the fact that agar is more cost effective.
Good quality absorbent papers actually are more expensive
than agar.