close up of spring-blooming dirty tree, rhamnus frangula, frangula alnus,

alnus background beautiful beauty bee biodiversity biotope bloomer blooming botanical branch bright buckthorn bush close closeup dirty erect flora flower flowers foliage frangula fresh garden green growth inflorescence leaf leaves natural naturalization nature nectar nicer outdoor pistil plant raceme racemose rhamnus season shrub shrubshaped spike spikeshaped spring springblooming stamen standing summer tree white wild