This is the 16309th most frequent Russian word.
редкий
Rare.
The word "редкий" in this sentence is used to describe the rarity or uncommon nature of the tree species, often indicating that it is not frequently encountered.
Это редкий вид дерева.
This is a rare species of tree.
Here, "редкий" signifies an exceptional, possibly unique quality of the talent, emphasizing that it is uncommon among people.
У него редкий талант.
He has a unique talent.
In this context, "редких" modifies "мануфактурах" (factories), expressing that such cleanliness in factories is uncommon.