I'd aim for 40%-ish as long as your temperatures stay below high 80s. If you're still getting anything close to those recent high temps, don't plant. Really, your chances for failure increase the higher the temps. A plant that has grown and developed since early spring — or better, the previous fall — has established an extensive network of feeder roots that are able to provide adequate water and nutrients to support it in the longer, hotter days of summer. With its foundation in place, the plant can direct its energy to flower, fruit and seed production, which is what it wants to do at this time of year. I'm explaining this to address your question about watering.
Drought-tolerant plants have developed coping mechanisms to withstand drought and also because they develop roots that are very efficient at pulling water from the soil, but while they are developing those roots
they need regular water. When you put a potted plant into the soil, you unavoidably damage its fine feeder roots and they need to regrow along with creating a wider and deeper root network. So you need to provide a steady supply of water but at the same time these plants don't like their feet to stay wet, so it becomes a delicate balancing act, which is one reason planting in hot weather is tricky, especially in arid climates. The drainage properties of the soil play a huge role. So yes, you might need to water daily, depending on heat and soil properties.
I am totally unfamiliar with your growing zone, but I see on the map that you're way the heck up there. I recommend seeking out local resources for info specific to your conditions. Independent nurseries, local gardening clubs, online blogs, neighbors, etc. I also strongly recommended getting this book:
Here is info about shade cloth
https://www-cmac-com-au.cdn.am...
Also explore the resources on this site; lots of good info here!
