Bugger 
That's okay. Parterre got a bit of a renaissance in the UK during the latter half of the 19th Century (fell out of favour in the early 1700's). It was slightly different in that it used blocks of coloured planting to form the shapes and forms rather than just the hedging but hedging was still used in places. The flowers/plants used were annuals so lived and died in the one year, requiring a full replant each time. This did allow them to showcase the 'latest' horticultural fashions though

Clearly the officer residing is a bit of a traditionalist who likes the hedging. Also, given the harsher climate the block colour planting only lasts a short time and has currently been cleared in preparation for the replanting.
(I don't know, botany lessons on monocot plants not long ago and now garden history. Clearly my time at uni wasn't totally wasted

)