If you wish to encourage olive growth, be prepared to water your trees with infrequent, deep waterings. Water newly planted specimens every third day for the first two weeks. Cut back the watering to once weekly after the first two weeks. Click to see full answer. Also, how much water does an olive tree require?International research concludes that one acre of a mature olive orchard will need between 2.4 and 4 megalitres of water (rainfall and irrigation combined) per year.Beside above, how often should you water olive trees in pots? Potted trees will need to be watered more often than trees planted in the ground. Allow the soil to dry somewhat before watering, then water until the soil is soaked. The normal, healthy potted olive tree will need fertilizer twice a year, once in the spring and once mid-summer. Similarly, do olives need a lot of water? Olive trees require a well-drained soil and a sunny position. Do not, however, confuse the olive for a desert plant. It needs regular watering to thrive. Insufficient water will cause your tree to suffer, and even die if left too dry for too long.How do you care for a potted olive tree?Plant your tree in a mix of potting soil and perlite or small rocks. When selecting a container, opt for clay or wood. Plastic containers retain more water, which can be deadly for an olive tree. Place your container grown olive trees in a spot that receives at least 6 hours of full sunlight each day.