A good general guideline is an inch of water per week, either by rain or watering; in arid climates, it is double that. In hot weather, vegetables need even more water, up to about ½ inch per week extra for every 10 degrees that the average temperature is above 60 degrees.
Keeping this in view, do I need to water my plants every day?
Usually when the first inch or so of soil is dry, it's a good indication that watering is needed. In summer, watering outdoor potted plants is necessary daily (and even twice a day) for most species, especially when temperatures reach over 85 degrees F. (29 C.).
Is it OK to water plants in the sun?
It is a piece of advice that has been followed by generations of gardeners - never water your plants in the full glare of the midday sun. But new research has contradicted the widely-held belief that watering in direct sunlight can cause leaves to suffer from unsightly "leaf burn".
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