So How Much Water Do Your Plants Need?
It depends on a number of things:
From where did the plant species originate (rainforest, desert, etc.).
Is it woody like a tree or shrub (You need a saw or clippers to prune it), or herbaceous like a geranium (You can squish it with your foot)? Woody plants can go weeks without water. Most mature trees can thrive on monthly deep watering.
Plants with small, narrow, and tough foliage can survive without water the longest. Plants with big, soft, thin leaves will require the most water. However, there are always exceptions.
Older established plants do not require the frequency of water that young plants require. But when you do water, soak ‘em good!
Plants use water at the same rate and amount regardless of soil type, but heavier soils stay wet longer that sandier soils and need to be watered less frequently than sandier soils..
Temperature, wind, humidity, solar radiation (sun intensity). Guess which factor will dry a plant out faster: high temperature or high solar radiation? It’s solar radiation. Air temperature is indirectly dependent on solar radiation.
Sun or shade exposure, reflected heat, low lying areas (frost), water runoff, obstacles to air flow (hedges, fences), etc. all have effects on the rate of water use by plants.
Bottom line: Don’t be afraid to experiment.
Skip watering for a week and see what happens (nothing will happen - unless it is super hot). Then try two weeks, three weeks or more, until you see signs of stress (pale leaf color, wilting). You will be shocked at how long your plants can go without water. When you do water, soak the heck out of your soil so all roots get some water.