I have just planted a bunch of ornamental grasses and coneflowers in a large garden bed 10’x12′. Can I use a sprinkler to water
them? Also, is once a day for an hour enough water for them? We are going through a hot spell in Vancouver right now, so should I water more than an hour each day?
I would only water the ground is dry down to two inches. If you feel moisture within this area at all, then it would not be a good idea to water. Coneflower are very drought tolerant, but will not tolerate wet soils for very long. Most grasses can handle some dry spells, so to be on the safe side, you will only want to water when it is almost completely dry.