The Giant Garden Umbrella is stored in a deep concrete or metal silo buried in the centre of the garden; the "cap" of the silo can be some sort of attractive garden ornament, perhaps a sundial.
When the remote control is activated, the cap moves aside, and the furled umbrella rises slowly and majestically
to its full height, which can be up to ten metres.
The umbrells then unfurls, covering the entire garden.
Pressing the other button on the remote furls the umbrella and stows it away until next time.
The silo has a built in hot air dryer system to dry the umbrella if it's put away wet.
A windspeed sensor automatically stows the umbrella if the safe wind speed is exceeded, and prevents it deploying in such circumstances.