What causes white chalk marks on hanging baskets?

Question

What causes white chalk marks on hanging baskets?

Answer 1

Lime scale, from the hard water.  You can scrub it off with a mix of vineagar and dish detergent.  Don't get it on the plants.

Answer 2

They are from the minerals in the water. When the water evaporates, the minerals are left behind.

Answer 3

White chalk

Answer 4

Sounds like you have an insect problem.

(but if its outside, try not to look at the baskets !!!)-- or plant  flowering plants there to overhang --over - the edges!

cheers!

Or ask for advice from your local garden centre!

cheers!