It has been a weird winter, hasn't it?
I've used the auto four-wheel drive only twice so far this year, and the manual FWD not at all. Last year it seems that I had it set on at least auto from November to March, and used the heavy-duty manual settings a few times as well.
Another plant that is OSE, and tough, is hydrangea
'Pinky Winky'. It is the most water-wise hydrangea in my gardens and blooms perfectly no matter what the weather conditions. It never seems to get droopy and ask for the hose, and it's situated in nearly full sun. Add a bit of summer compost or mulch and it's good to go.