I do believe that linseed paint should be considered for any paint work in gardens as the affinity between the two is so great. Linseed oil paint is made from pressed flax seed.
This cold-pressed oil then gets boiled to increase its viscosity to get boiled oil. To the boiled oil we then add raw-earth pigments. No solvents and paint based on vegetable oil and raw earth pigments. Talking about the perfect cradle-to-cradle products.
How beautiful is this field of flax!