autumn cherry leaves sillhouetted against a blue sky

abscisic air arboretum autumn autumncolours autumntrees background blue bluesky botany branch bright cherry color colorful colour colourful detail ecosystem england fall fallcolors falltrees five fresh garden gardening gardens green harcourt harcourtarboretum leaf leaves light nature oak october orange outdoors oxford photosynthesis prunus september sillhouetted sky sun sunlight taken tree trees twig veins water