River Birch

The 10 River Birch trees that I planted a few months back are all alive (I think). Some have shown green leaves; others seem more ornery and are still in the bud stage. I've been watering them every other day and have no idea if this is enough, too much, not enough water. It's how I watered all my other baby trees, so am hoping for the best. As it gets hotter, I may have to water them every day. It's all guesswork for me, but so far I've been fairly successful with all the little trees I've planted in the yard. Certainly, shade or sun make a difference: some are planted where they get a lot of morning shade; some get late afternoon shade.