Woodland Trust

Nature's CalendarNature Detectives

Horse Chestnuts will be becoming bare soon - record your sightings with Nature's Calendar

Oak first leaf. Pete HolmesFirst leaf

First leaf fully open, and recognisably the shape, if not the full size of the adult leaf

  • For compound leaves like ash the leaf must be erect but the pinnate leaflets don’t yet need to be
     
  • For larch first leaf is the start of needle forming. At the base the needles are still joined in the bud cover but the tops of the needles have separated.
     
  • Use mature trees (30 years old or more), as young trees show different responses
     
  • Even trees of the same species, close to each other can behave very differently
     
  • If in doubt, wait until first leaf happens on 3 trees of the same species

First bud or first leaf - why is it important?