Portraits of gardens by Spanish painter Santiago Rusiñol. Living from 1861 to 1931 he used more shades of green than I can count.

"Parc Badés, Arbúcies." 1929.
“Parc Badés, Arbúcies.” 1929. Image © Sothebys. Artwork in the public domain in the United States because the artist died over 70 years ago. via http://www.sothebys.com/es/auctions/ecatalogue/2012/european-paintings/lot.80.html
The Old Stairs (Pedres velles), Raixa. 1907.
The Old Stairs (Pedres velles), Raixa. 1907.
The Old Stairs (Pedres velles), Raixa. 1907.
“The Old Stairs (Pedres velles), Raixa.” 1907. In the public domain in the United States because the artist has been dead over 70 years. via http://www.fieldandgarden.com/2018/06/art-for-inspiration-old-stairs-raixa-by.html
"Aranjuez Garden, Arbor, II." 1907.
“Aranjuez Garden, Arbor, II.” 1907. Collection of the Museo Nacional Centro de Arte Reina Sofía, Madrid. Cc0 license 1.0. via Museo Nacional Centro de Arte Reina Sofía
"Aranjuez Garden. Arbor, II." 1911.
“Aranjuez Garden. Arbor, II.” 1911. Collection of the Museo Thyssen-Bornemisza, Madrid. In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:1907_Rusinol_Garten_von_Aranjuez_anagoria.JPG

Landscapes by Estonian artist Konrad Vilhelm Mägi. Living from 1878 to 1925 he seems to have loved bright colors as much as I do. Loving his bouncy clouds.

Landscape with Rocks. 1913-1914.
Landscape with Rocks. 1913-1914. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Konrad_M%C3%A4gi_-_Maastik_kividega_1913-1914.JPG
Landscape. ca. 1923-24.
Landscape. ca. 1923-24. In the public domain in the United States because the artist has been dead over 70 years. via https://fineartamerica.com/featured/landscape-konrad-magi.html
Landscape. 1908.
Landscape. 1908. In the public domain in the United States because the artist has been dead over 70 years. via http://wiki.cultured.com/people/Konrad_Magi/

The green of summer whenever you need it. Landscapes glowing with emerald tones by Russian artist Arkhip Kuindzhi. (1842 to 1910).

"A Birch Grove." 1879.
“A Birch Grove.” 1879. Oil on canvas. Collection of the Tretyakov Gallery, Moscow. In the public domain in the United States because the artist died over 70 years ago. via https://www.wikiart.org/en/arkhip-kuindzhi/a-birch-grove-1879
"Kuindzhi Forest." 1887.
“Kuindzhi Forest.” 1887. In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:Kuindzhi_Forest_1887.jpg
"A Birch Grove." 1901.
“A Birch Grove.” 1901. Oil on canvas. In the public domain in the United States because the artist has been dead over 70 years. via https://www.wikiart.org/en/arkhip-kuindzhi/a-birch-grove-1901

Tropical landscapes so well done you can almost hear the trade winds blowing through the palm trees. American. 19th century except for the last.

"Fishing in the tropics." Undated.
“Fishing in the tropics.” Undated. Oil on canvas. Edwin Felix Kanute, artist (1852-1935). Image © Doyle Auctions. Fair use license. via https://doyle.com/auctions/17am01-american-paintings-furniture-decorative-arts/catalogue/36-kanute-edwin-felix
"Tropical landscape with fishing boats." Undated.
“Tropical landscape with fishing boats.” Undated. Oil on canvas. Albert Bierstadt, artist (1830-1902). In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:Bierstadt_Albert_Tropical_Landscape_with_Fishing_Boats_in_Bay.jpg
"Sunset, Tropical Marshes, Florida." ca. 1880.
“Sunset, Tropical Marshes, Florida.” ca. 1880. Oil on canvas. Martin Johnson Heade, artist (1819-1904). Collection of the Morse Museum. In the public domain in the United States because the artist has been dead over 70 years. via http://www.morsemuseum.org/collection-highlights/paintings/heade-painting
"Tropical landscape." 1853.
“Tropical landscape.” 1853. Oil on canvas. Frederic Edwin Church, artist (1826-1900). In the public domain in the United States because the artist has been dead over 70 years. https://www.oceansbridge.com/shop/styles/hudson-river-school/tropical-landscape-1873
"Red Shirt, Homosassa, Florida." 1904.
“Red Shirt, Homosassa, Florida.” 1904. Watercolor over graphite on paper. Winslow Homer, artist (1836-1910). Collection of the National Gallery of Art, Washington, DC. In the public domain in the United States because it was published before January 1, 1924. via https://commons.wikimedia.org/wiki/File:Winslow_Homer_-_Red_Shirt,_Homosassa,_Florida_(1904).jpg

Landscapes to dream of summer as winter sinks her cold way in . . .by Italian landscape artist Teodoro Wolf Ferrari (1878-1945).

Undated work. Title not known.
Undated work. Title and location not known. via https://altermediascuola.wordpress.com/2018/06/19/finissage-della-mostra-teodoro-wolf-ferrari-visite-guidate-aperitivo-concerto/.
Landscape with trees and water. Date not known.
Landscape with trees and water. Date and location not known. via https://www.veneziepost.it/conegliano-2-febbraio-la-mostra-teodoro-wolf-ferrari-la-modernita-del-paesaggio/
"Sunset with Pond." Undated.
“Sunset with Pond.” Undated. Image via the artstack.com. via https://commons.wikimedia.org/wiki/File:Teodoro_Wolf_Ferrari_-_Tramonto_con_stagno.jpg.
Landscape with water and two ladies. Undated.
Landscape with water and two ladies. Undated. Image via https://commons.wikimedia.org/wiki/File:Teodoro-wolf-ferrari_3.jpg.

All artwork in the public domain in the United States because the artist has been dead longer than 70 years.

Tropical sunsets to warm one’s heart . . . spending decades in the rain forests of Brazil painting hummingbirds and orchids Martin Johnson Heade painted sunsets for the stars to sink into even in Newburyport, Massachusetts a place about as untropical as they come. American, 1819-1904.

"Sunset over the Marsh." ca. 1876-1882.
“Sunset over the Marsh.” ca. 1876-1882. Oil on canvas. Image © Heritage Auctions. Artwork in the public domain in the United States because the painter has been dead over 70 years. via https://da.wikipedia.org/wiki/Fil:Sunset_over_the_Marsh-Martin_Johnson_Heade.jpg.
"Twilight." ca. 1886.
“Twilight.” ca. 1886. Oil on Canvas. Collection of the High Museum of Art, Atlanta. In the public domain in the United States because the artist has been dead over 100 years. via https://commons.wikimedia.org/wiki/File:Twilight_by_Martin_Johnson_Heade,_c._1886,_High_Museum_of_Art.jpg
"The Great Florida Sunset." 1887.
“The Great Florida Sunset.” 1887. Oil on canvas. In the public domain in the United States because the artist has been dead over 100 years. via http://img.wikioo.org/ADC/Art-ImgScreen-1.nsf/O/A-8LSLGH/$FILE/Martin_johnson_heade-the_great_florida_sunset.Jpg.