A lot will depend on how porous your soil is.
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My plants, in Walybag containers, are growing in a very loose mix of ProMix HP (High Porosity, indeed!) and assorted 'stuff.' The mix is perhaps too fluffy, if such a thing is possible. Here in Az, I need to completely drench each plant every other day - well over a quart - to avoid significant wilting and deep dying of the soil. The water gets evaporated, cooling the soil and making the plants quite happy. I'm confident that an inch of monsoonal rain won't even tickle the plants.
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OTOH, my early-season soil mix was definitely too dense (The real cause was a dense grower trying to go uber cheap!), and I had chronic root rot, chlorosis, and other problems, despite being very frugal with the water.Â
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If the soil drains well and the containers have plenty of vents, I suspect the plants will rather enjoy the drink. As suggested, gently applying a few more fertz probably won't hurt.