Around 21 June 1816 John Keats begins gathering ideas for his longest poem to date, ‘I stood tip-toe upon a little hill’:
A bush of May flowers with the bees about them;
Ah, sure no tasteful nook would be without them;
And let a lush laburnum oversweep them,
And let long grass grow round the roots to keep them
Moist, cool and green; and shade the violets,
That they may bind the moss in leafy nets.
A filbert hedge with wild briar overtwined,
And clumps of woodbine taking the soft wind
Upon their summer thrones; there too should be
The frequent chequer of a youngling tree,
That with a score of light green brethren shoots
From the quaint mossiness of agèd roots:
Round which is heard a spring-head of clear waters
Babbling so wildly of its lovely daughters
The spreading blue-bells—it may haply mourn
That such fair clusters should be rudely torn
From their fresh beds, and scattered thoughtlessly
By infant hands, left on the path to die.
At the time he began this, Keats was living two lives; medical student by day, and poetic groupie by night. His first poem had been published in(see 5 May 1816), although he had yet to meet the magazine’s editor James Leigh Hunt. Twelve years later, Hunt recalled that the poem had been suggested ‘by a delightful summer-day, as he [Keats] stood beside the gate that leads from the Battery on Hampstead Heath into a field by Caen Wood.'. Keats chose ‘I stood tip-toe upon a little hill’ to open his first collection Poems, by John Keats in 1817.
 James Leigh Hunt (1828) Lord Byron and Some of his Contemporaries (1976 reprint: New York, Georg Olms Verlag) p. 413. Caen Wood is now known as ‘Kenwood’.