In 2006, a working group was formed in Germany to focus on sequoias.
In 2014, the 150th anniversary of the sequoias was "celebrated". At this point, 132 surviving specimens were known.
There are also numerous other designated locations for sequoias in Baden-Württemberg outside of the state capital – in castle gardens, forests and parks. From 1870 onwards, transplantation was carried out by the forestry offices in Weinheim, Lorch, Schorndorf, Winnenden and Heimerdingen near Vaihingen (Enz). A total of nine specimens have been preserved in the forest district of Welzheim: six from the planting year 1866, two from 1893 and one from 1918. In addition, 24 pieces were planted in 1958 in a closed nursery. Of these, 18 are still standing. Heidelberg has a sequoia forest with 30 trees, and there is a mighty tree in Ochsenbach. Sequoias can also be found in Remshalden, Weinstadt, Wüstenrot and Hemmingen. The currently (March 2014) highest sequoia in Germany is located in Oberbrüden (Auenwald) at 55.8 meters. The strongest (diameter at breast height 4.1 m) is in Neuweiler. The specimens on the Felsenmeersteig hiking trail in Albstadt did not grow quite as large.
Source:
de.wikipedia.org/wiki/Wilhelma-Saat
Other interesting sources:
stuttgarter-nachrichten.de/inhalt.mammutbaeume-in-der-wilhelma-5000-mammuts-aus-federleichten-samen.ef88ce4a-d62e-4fdc-a315-0d50e45042c1.html