This is the 3749th most frequent Japanese word.
そこら
"そこら" means "around there" or "that area."
In this sentence, 'そこら' refers to a nearby, general area.
そこら辺に置いてください。
Please place it around there.
Here, 'そこら中' emphasizes the proximity and generality of the area being described as having blooming flowers.
そこら中に花が咲いている。
Flowers are blooming everywhere around there.
The use of 'そこら' indicates an unspecified, common set of stores in the vicinity.