Before I get to the specific vegetables, it's important to go over a few general watering tips.
To ensure you’re watering efficiently, group plants with similar watering needs together in your garden, so you can set the drip appropriately to water less.
Hothouse plants
According to Oregon State University, a tomato plant's need for watering is negated by the deep roots the plants establish over the season. As above, you want to water sufficiently early in the season as roots are established while taking care not to over water, which will result in those roots staying close to the surface.
If the plant needs water, those roots will grow deeper in search of moisture. Reducing water greatly, if not cutting it off entirely mid-season, shouldn’t harm your harvest. The lack of surface water will reduce disease spread, and tomatoes will ripen if you reduce their watering. It’s not only tomatoes, either: Squash, which includes zucchini, summer and winter squash, as well as melons, eggplants, and hot peppers all behave the same in terms of water needs and roots.
Beans
Credit: Amanda BlumMost beans, particularly pole beans, have adapted to drought conditions over time. As such, they can survive and produce flowers and fruit with minimal moisture. Beans require water to germinate, so if you direct sow, ensure the seeds have consistent moisture levels. Once germinated, you can reduce (but not eliminate) water. Since beans have such a short season (usually 60 days or less), they require less water simply by existing for less time. Less moisture is going to reduce common bean problems like powdery mildew, a quickly spreading surface fungus.
Chard and okra
Credit: Amanda BlumBlueberries prefer less moisture
I know, blueberries are a fruit and not a vegetable, but I felt compelled to include the advice here anyway. Consider it a bonus tip.
I’ve since changed the elevation of my blueberries to ensure better drainage and moved watering lines further away—the results were astounding. I experienced better yields, but the berries themselves were plumper and better tasting. This isn’t conclusive, of course, since there are too many variables to account for, but I take the advice of a blueberry expert seriously.
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