MM wrote:
I can't visualise the quantity. Is it a lot? It's 219 UK gallons,
but
that is still a quantity I can't really get my head around. How
much
would I use watering the garden? 20 minutes with a spray head on a
hose over approx 75 square meters, that is.

I wouldn't water my garden that way, and I don't know what the flow
rate is for a typical domestic supply: mine seems to be about six
gallons a minute, which would mean 120 gallons in 20 minutes without
a spray head to slow it down.

The wonderful Google window I've only recently found out about
converts 20 m^3 to 4,399.38315 Imperial gallons. At two gallons per
shrub, 1 m^3 or 219 gal does, of course, about a hundred shrubs.

--
Mike.