Paeonia ludlowii P. lutea P. delavayi ludlowii

The Tibetan or yellow tree peony, grows about a metre tall with multiple stems.  Produces bold, large yellow flowers in spring, freely self-seeding to brighten sun or part-shade spots year after year.

Tibetan Tree Peony / Yellow Tree Peony. Lutea is the common name, but incorrect. Easly grown in sun or part shade, almost a weed, it seeds about freely and you will have new plants to share. Like all peonies the seeds take 2-3 years to develop into shoots and leaves you would call a plant! About 1m tall,  with multiple stems and in spring bold, big yellow flowers. 

Flower: Dwergenpaartje, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

Shrub: peganum from Henfield, England, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons