Large yellow loosetrife, Lysimachia punctata. Spreads freely, very tolerant.

Lysimachia punctata and in perfect conditions it will run freely. it can be a thug if you are not careful.

welcome to GoY too ;o)

Does this only flower once in the season

Should go on until early Sept.

It’s very invasive if allowed to be, keep it in check by reducing the clump in the autumn, does well in pots, and as a rule flowers early June into mid July, as autumn approaches the leaves can take on pinky yellow tones which look great.

Ah! I was wondering what the name was as I have it growing in the front & back of my garden, nice bright yellow & pops back up year after year :o))

I think they used to be part of shrub for hedging when sold in group of five types to give a variegated hedge. Agree with previous comment very invasive, and hardy.

this isn't a shrubby type though, I wonder if you are thinking of Hypericum one of the st john's wort type.
this plant dies down totally in the winter just leaving bare stems that rot away.