Part of the protected area in the city of Nettetal, it is situated in the "Kaldenkirchen Grenzwald" (forest bordering Germany and the Netherlands).

There, and in a nearby laboratory-plantation several acres wide from 1952 on, they cultivated 1,500 giant sequoia (Sequoiadendron giganteum) seedlings from seeds of US origin from Martin's nephew Albert A. Martin of Santa Barbara, CA.

[1] The seeds were collected in Sequoia National Forest at different elevations, wrapped in burlap to preserve them and sent to Germany.

They wanted to find out if the giant sequoia, which had existed in Germany before the ice age, could be introduced to German forestry.

[4] Part of the field exclusively planted with giant sequoia was reserved for obtaining results of productivity by the "Ecology and Forestry Department" of North Rhine-Westphalia (NRW).