To help get plants established, it is the roots which need watering, and regularly. One way to direct water to the roots, especially if you have planted on a slope where the water may just run off, is to sink a water bottle alongside the plant with the bottom cut off.
When you water, put extra water into the bottle and it will run down deeper towards the roots.
This is also good for plants such tomatoes, as illustrated, where it is important to keep the water off the leaves to reduce disease. More about growing tomatoes.