Wood Spurge (Euphorbia amygdaloides var. robbiae) is particularly vigorous in the garden at the Camden Art Centre [see last entry]. It was part of the original planting back in 2004 and has increased considerably since then. 

 A good choice for shady woodland plantings it has a suckering habit so is known as a spreader. Here it has formed extensive drifts which create a shimmering haze in hues of lime green and acidic yellow.