The severely geometric King's Knot viewed from the castle.
The earliest instance I came across of hexagons incorporated into garden design was in the rather fanciful fortified vegetable garden by Stephen Switzer in his Ichonographia Rustica of 1718. Batty Langley's New Principles of Gardens
from 1728 includes a hexagonal pool in the proposed layout for part of
a park. Neither of these were constructed and appear as theoretical
exercises only. In fact the only major historic structure, which is
essentially hexagonal that I am aware of is Wardour Castle, Wiltshire,
a remarkable tower house dating from the fourteenth century. In the
context of domestic constructions one shouldn't forget the remarkable
pentagonal Villa Farnese at Caprarola which is also based on a
fortification.
Who needs to fortify their vegetable plot?
Ground plan of Wardour Castle.
Six sides: Wardour Castle
Five sides:
Villa Farnese
Where these thoughts take a rather alarming turn is when one considers
instances where hexagons do appear in images of gardens that are
clearly of fantastical in nature and symbolic in significance. For
example the notoriously obscure Hypnerotomachia Poliphili
partially published in English in 1592 illustrates a large hexagonal
basin below a fountain whilst in the Jesuit Henry Hawkins's Partheneia Sacra
of 1633 a hexagonal walled garden space is adapted as a icon and
chapter heading. A colourful hexagonal garden is also portrayed in a
compendium of alchemical images in a collection from the early
eighteenth century held in the Beinecke Rare Book and Manuscript
Library of Yale University. The image is undated but appears to be
early modern rather than late medieval... and it's got a unicorn!
Renaissance revels from
Hypnerotomachia Poliphili contrast with Hawkins's intensely Catholic symbolism.
Unicorn and fountain - no idea what else is going on here.
So if the central element of the water parterre at Hanwell turns
out to be hexagonal what are we to make of it? Is this simply an
eccentric local whim or does it have greater/deeper significance? Watch
this space.