How do marigolds help with varicose veins?

from a book called Grandma Putts VINEGAR, GARLIC,BAKING SODA PROBLEM SOLVERS

The herb marigold is valuable in varicose veins. A compress of this herb should be applied externally in the treatment of this disease. The flowers of this plant can also be applied externally over varicose ulcers with beneficial results, as they are an excellent remedy for inflamed or ulcerated conditions of the skin.

P.S.
Raw vegetable juices, especially carrot juice in combination with spinach juice, have proved beneficial in the treatment of this disease. The formula proportions considered helpful in this combination are 300 ml of carrot juice and 200 ml of spinach juice.

Certain nutrients, especially vitamins E and C have also been found effective in the treatment of this disease. The patient should take vitamin C in therapeutic doses up to 3,000 mg and vitamin E in therapeutic doses from 600 to 1,200 mg daily. This will relieve him of pain and leg cramps associated with varicose veins.