The message
from "Franz Heymann" contains these words:

Some seeds need to be scorched on the outside.

Scorched? Around 200 deg C?

Nah. More than that. Some seeds from American (Continent, not US)
forests will only germinate after having been through a forest fire.

Clever mechanism to be sure that there will be enough light to sustain growth.

--
Rusty
This space scribbled in in case someone nicks it before I find a decent sig.