"Since I have been here, I have had enough work with the overgrown garden with its large pine trees, under which there grows tall and poorly-tended grass, mixed with all kinds of periwinkle."
Dating of this piece is difficult as neither Vincent nor Theo mention it specifically.
Courtesy of Wikipedia:
Van Gogh explored the grounds of the asylum where he found an overgrown garden. He wrote, “Since I have been here, I have had enough work with the overgrown garden with its large pine trees, under which there grows tall and poorly-tended grass, mixed with all kinds of periwinkle.” (in a letter from Vincent to Theo in May of 1889) The paintings are of growth below ivy covered trees.
Van Gogh Museum says of Undergrowth with Ivy (F745): “The effect of light and shade created an almost abstract pattern, with small arcs of paint covering the entire surface of the canvas.” The second Undergrowth with Ivy painting (F746), also of undergrowth beneath trees, is made with small brushstrokes to create a blurred image that also shows the effect of light shining through the shaded trees.
Painting, Oil on Canvas – Size 49 x 64 cm – Size 15 Paysage
Saint-Rémy: July, 1889
Van Gogh Museum
Amsterdam, The Netherlands, Europe
F: 745, JH: 1764