The green countries still have unlimited payments in cash, all the other countries NOT. Cash payments are mostly limited to 3000 euro. Partial payments are not allowed. So buying a car for 5000 euro cannot be done by making 2 seperate cash payments of 2500 euro each.
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Interesting map, below is a link with more details, actually more of the strong economies don't have much of a restriction for cash transactions than your map implies (without more details of the different colour meanings at least)
http://www.europe-consommateurs.eu/...PDFs/PDF_EN/Limit_for_cash_payments_in_EU.pdf