Posted: 30/08/2017 at 10:21
I wonder where you are, Pierre, you have a French name. I live in Dordogne. I have roses and blueberries in pots and I give them a good soak every other day, but not in winter when they are dormant. I water in the evening as it can get hot here in the day, then the plants get a chance to soak up the water at night.
Blueberries are acid loving so mine are planted in ericaceous compost and I only water them with rain water. Our tap water is hard and they don't like it.
As they are in pots, not in the ground, I feed them more often than usual, especially the roses which can be greedy plants. I feed roses in pots with rose fertiliser every 6 weeks through the growing season. I feed the blueberries with fertiliser for acid loving plants, such as azaleas.