Where the sun don't shine.

Taxus bacata fastigiata Standishii. =Lang thin Yew.
Cedrus atlantica glauca pendula ="Stragly evegreen" as a mate once desrcibed it in earlier days.

AT the suggestion/command of her indoors, the latter has been, steadily dog-arsed (Cur-tailed). The result is an area of yew which hasn't seen a lot of sun, even in April.
It became obvious that sunlight is an integral part of the yellowing process.