This is a salon-style character piece by the French composer Théodore Dubois. It is distinguished by its graceful, rolling accompaniment and a sweet, vocal-like melodic line typical of late 19th-century French music.
The primary challenge is maintaining a consistent, flowing triplet accompaniment while bringing out the expressive melodic phrasing.
Comparable difficulty and character — good candidates for what to learn next.
Au jardin (piano) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Au jardin (piano) lasts about 3 minutes.
Au jardin (piano) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Bergerette by Théodore Dubois, Berceuse by Théodore Dubois, Ave Maria in A-flat major by Théodore Dubois — see the full similar-pieces list on this page.