@Wildlifelover Anything that you have to plant in such dry conditions will benefit from being plunged in a bucket of water to cover the compost. When the air bubbles have gone[can be ten mins to half an hour] water the actual hole and plant. No need to water the surface. This will encourage the roots downwards.
I was at the local GC last week, it was hot. The staff were watering non stop. I picked up a couple of plants that had been watered as the leaves were wet. A quick touch of the compost told me there was some dampness but that the roots were still dry.