Last year I watered three times a week, fairly deeply.

This year I am pressed for time so I am watering once a week
but very deeply. Making the rounds in a cycle so that there
is time for the water to soak in. (I still use the &%$# hose,
so all is imprecise.)

The roses seem to like it, even though it has been in the
nineties. I like it because if it is Saturday, it must mean
water the roses. However--I should point out that I have no
brand new baby plants; all are 1-5 years in the ground or large
pots.