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First leaf

Record first leaf when the leaf is fully open and recognisably the shape, if not the full size of the adult leaf. 

If you have recorded oak (sessile) events before, continue to record on the same tree.

Expected Date Range: early April to mid-May 

Available historic data: we have good records from 1938-1947

Just right

  • Sessile oak first leaf
    (Kylie Harrison Mellor/WTML)

Too early

  • Sessile oak first leaf too early
    (Kylie Harrison Mellor/WTML)