Euphorbia

[Véronique Macrelle]

here is a plant coming from a seed of a neighboring garden, no doubt.
 90 cm high
beautiful all year

 it looks like Euphorbia characias, maybe, but I find it really pretty when it grows half-shade, almost in complete shadow rather than the sun and it supports my very clay-rich, water-soaked soil, hence my doubt. it is far from the scrubland

 What do you think; are there hybrids?

[majallison]

Euphorbia x martinii is the (shade-tolerant) hybrid between E. characias & E. amygdaloides, but your plant looks like pure characias (which is very variable... with two subspecies & many named clones).

[Véronique Macrelle]

Thank you Malcolm.
 it really seems in its place at the foot of the birch: very lush ...
perhaps the plants have adapted in a few generations of seeds?
 I have some spontaneous seedlings.