Closeup of green summer shoot. Tammisaari archipelago, Finland. Wild. 2011-06-11.

Green summer shoot. Tammisaari archipelago, Finland. Wild. 2011-06-11.

Young summer shoots of E. arvense (upright branches) and E. sylvaticum (gracefully hanging branches). Tapanila, Helsinki, Finland. Wild. 2010-06-02.

Spring shoot. Tapanila, Helsinki, Finland. Wild. 2010-05-30.

Summer shoot. Tapanila, Helsinki, Finland. Wild. 2010-05-30.

Equisetum palustre with Equisetum arvense. Liljendal, Finland. Wild. 1996-05-01.

Equisetum arvense with Equisetum sylvaticum. Vantaa, Finland. Wild. 1992-07-01.

Green summer shoot. Liljendal, Finland. Picked. 1992-07-01.

Making a horsetail decoction: boiled greens, a glass of the resulting decoction, and a green twig for decoration. Helsinki, Finland. Processed. 2003-05-30.

Making a horsetail decoction: boiled greens, a glass of the resulting decoction, and horsetail greens. Helsinki, Finland. Processed. 2003-05-30.

Making a horsetail decoction: boiled greens, a glass of the resulting decoction, and horsetail greens. Helsinki, Finland. Processed. 2003-05-30.

Sporestalk in early spring. Annala, Helsinki, Finland. Wild. 2005-05-02.

Fertile spring shoots. Isnäs, Finland. Wild. 2002-04-24.

Really lush growth. Helsinki, Finland. Wild. 1999-06-01.

Really lush growth. Helsinki, Finland. Wild. 1999-06-01.

Closeup of young green shoot. Koivukylä, Vantaa, Finland. Wild. 1992-07-01.

Sporestalk in spring. Tammisaari archipelago, Finland. Wild. 2005-05-05.

Sporestalks in spring. Tammisaari archipelago, Finland. Wild. 2005-05-05.