Yellow Loosestrife - Lysimachia vulgaris

A perennial that forms clumps by creeping stolons or rhizomes. Leaves are ovate, green, sometimes with black dots, and occur in groups of three or four, and yellow flowers are borne in terminal clusters in summer
Ultimate height - 1-1.5m
1–1.5 metres
Time to ultimate height
2–5 years
Ultimate spread 0.5-1 m
0.5–1 metres

Growing conditions
Clay
Loam
Moisture
Poorly–drained

Position
Full sun
Partial shade