Thalictrum flavum glaucum

The yellow appearance of these flowers is produced by a dense puff of protruding stamens emerging from small sepals, just like the species. The glowing clusters of tiny flowers are contrasted sharply by the dull blue-green, coarse lace-like foliage. The plant's tall stems are best suited for the back of the border, where they will make a lovely display from January- February. Rhizomatous. 1.4-1.8m. 

Check out this well written information, and look at the lovely images therein.  Dan Pearson, the author of this great online-mag, moved it to a hard, stony, rubble infested bit of ground to ensure it was kept in check and to do a good job, running lean mean to ensure they don't need staking.  I have purloined a photo in the meantime, I hope spreading the word makes up for this!

 https://digdelve.com/thalictrum-flavum-subsp-glaucum/

"The flowering of the grey-leaved form of the meadow rue marks the longest days of the year. Rising steadily and with much optimism they hit their luminous stride in the fortnight that bridges the solstice. Hopping and skipping from the narrow bed in front of the house to gather in a concentrated colony around the corrugated tin barns, we follow their sulphur-yellow trail to witness the evenings caught in their plumage."