How often to water is a weather question. This planner has no weather feed and will not invent a schedule.
Well established · suboptimal if ignored → advise
How it works
How fast ground dries is set by rainfall, temperature, wind and humidity - none of which this app observes. An interval computed without them is a guess wearing a schedule's clothes.
What to do about it
Check the soil, not the calendar: push a finger in to the second knuckle and water if it is dry at that depth. That is a method rather than a number, and it is the honest substitute for a frequency nobody can compute for your week. When you do water, put it on the soil rather than the leaves, and water long enough to reach the roots rather than only darkening the surface.
The evidence
Evidence: settled without a trial - epistemics.