Nettle Leaves by Spice Mart. Nettle Loose Leaves. Nettle tea is a pleasant caffeine free tea substitute which has a rich, green, earthy aroma and flavour. To make a mug of tea add 1-2g of the tea to a teapot or infuser - depending on how strong you like your tea – and pour over enough fresh boiling water as require 100% pure with no fillers, colours or binders.