These parks are the oldest in the city and were once a single plot called the “Walking Garden” which was constructed all the way back in 1840. At the time, the green space, being the only park in Łódź, had much more of a forest feel than a park (think lots of trees and muddy grounds). 
But over the ensuing years it was built up with walking paths, benches and two gazebos. It was divided in 1850 when the western section (Zrodliska II) was sold to Karol Scheibler and the eastern section (Zrodliska I) was privately leased for a few years.
The 20th century saw the park lose its private nature and become a space – once again – for the public. Park I changed first with a whole new appearance in the 1920s that included new paths, a pond, a botanical garden, a playground, flowerbeds and more. In the mid-20th century, Park II was opened to the public along with (a massive win for public space) the gorgeous Palm House, which was also opened to the public. As the name suggests, the building holds thousands of species of – mostly tropical and desert – plants including cacti, palms, fig trees and many more. 
Now, the two parks are a beloved city feature. In Park I (the eastern park) you’ll find ponds, lots of flowerbeds and sculptures, and public chess tables that are still commonly used by parkgoers. In Park II (the western park) you’ll find great walking paths and a gazebo – but few connections to its industrial past (Scheibler’s buildings that once stood there have since been demolished).