The whole sentence is badly written, and that phrase is particularly bad, Behnazzz. It seems that the writer simply wanted to say that 'gardeners all over the world have something in common'.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Grammar GeekThe phrase "the world over" is used to show how universal something is. To combine it with "universally" makes it redundant.Not to mention superfluous, repetitive and not really needed.