There’s no good answer to that. We drink when we’re thristy and it’s the same with plants. Too many variables can enter the picture: light, wind, rain, temperature, humidity and the type of plants installed... Some general guidelines are as follows: after installtion keep the plants moist for two weeks, water everyday if it doesn’t rain at least a half inch. For the next two weeks water three times per week, or everyday if it is hot and dry. You will need to keep the new installation watered carefully for the first year. The plants should then be rooted in well enough to withstand a little stress. This does not mean no water! Water your plants when they are dry. Look at the soil to see if it is dry, learn to recognize drought symptoms. Your plants will tell you when they are thirsty. Check them daily and water as needed. Look for any or all of the following symptoms:

Wilting

Wilting merely indicates root damage. Always feel the soil to make sure it’s not already too wet. If the plant is wilted and the soil is dry, water. If it is still wet, let it dry out before watering again.

Folding or Cupping

Many plants merely fold up their leaves when they are dry. Lawn grasses are excellent examples. Their leaves either fold like a book or roll like a newspaper.

Color Changes

Some plants never wilt, fold or curl when dry. Their leaves simply lose their rich green coloration. Hollies are excellent examples. Their foliage, when dry, turns a dull metallic green color.

Low maintenance is low maintenance, it is not no maintenance.