Tut tut, Modeste Guérin was not by any means just a peonist, and was indeed a raiser of roses: "Another fact which shows in the most obvious manner that varieties can by force of nature alone arise spontaneously and without outside help is that which I have from Mr. Modeste Guérin. This horticulturist assures me of this, having gathered a fruit from a Rose of which the blossom had remained in bud, and was only but impertectly developed without having opened completely, and which consequently could not have been fertilized by anything but its own stamens. This hip which Mr. Guérin gathered gave five seeds which this grower sowed separately, and which gave in due course five different varieties," from Loiseleur-Deslongchamps' "La Rose," 1844, p. 165.

Further: “The catalog of Mr. Modeste Guérin, horticulteur of Belleville, particularly shines in its rich collection of Peonies announced there […]. The other branches of Horticulture are however not neglected at Guérin’s: A good selection of outdoor plants, those of the orangery, Dahlia, Rhododendron, Verbena, Fuchsia, Roses, etc., is there,” Journal d’Horticulture Pratique, vol. 1, 1844, p. 96.