Salix cinerea
From LSJ
τὸ δανείζεσθαι τῆς ἐσχάτης ἀφροσύνης καὶ μαλακίας ἐστίν → being in debt is a mark of extreme folly and moral weakness (Plutarch, On Avoiding Debt 829F3)
Wikipedia EN
Salix cinerea (common sallow, grey sallow, grey willow, grey-leaved sallow, large grey willow, pussy willow, rusty sallow) is a species of willow native to Europe and western Asia.
The plant provides a great deal of nectar for pollinators. It was rated in the top 10, with a ranking of second place, for most nectar production (nectar per unit cover per year) in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative.