Vincent van Gogh’s various paintings of cut sunflowers in a vase (e.g. Sunflowers 1888) are probably his best-known flower paintings, but he also painted growing flowers, such as these irises. I enjoy not only his use of colour and mark making, but the way he makes flowers fill the whole composition and flattens the depth of field (an influence from Japanese art on him). A floral colour field, to apply a concept from a few decades later, and another influence on my painting, Rothko.
Other examples: Long Grass with Butterflies in the National Gallery, London, Ears of Wheat and Butterflies and Poppies in the Van Gogh Museum in Amsterdam, Tree Trunks in Grass in the Kröller-Müller Museum. If you search using “field” or “garden” or “blossom” rather than “flower” (along with “Van Gogh painting”) you’ll find photos more easily.