Parkinson's London house was in Ludgate Hill, but his botanical garden was in suburban Long Acre in Covent Garden, a district of market-gardens, today close to Trafalgar Square. Not much is known about the garden, but based on a study of the writings of Parkinson and others, John Riddell has suggested that it was at least in size and probably surrounded by a wall. Four hundred and eighty-four types of plant are recorded as having been grown in the garden. Thomas Johnson and the Hampshire botanist, John Goodyer, both gathered seeds there.