I have a drip irrigation system to water my roses, each rose has two 4
litre/hour drippers. At the moment I am leaving the system running for
an hour in the late evening each day. The ground seems damp enough and
the roses are flourishing but it seems a lot of water for each rose. Can
anyone give me an idea how much water a four year old [or older], bush
rose, would need?
I live in Sydney [Aust.] and we are in the middle of a severe drought
so any possible savings without compromising the plants is in the
general interest of the community.

DD