Since SaigonâÂÂs fruiting months have average humidity of 73%, and we have more drier climate in southern Cal, then I think I would increase water to 1â per month from 0.5â as stated in previously post.

You also need to be mindful that mangos behave differently in temperate climates to what they do in tropical climates. In the tropics they flower in mid winter (mid dry season). The fruiting peaks in the "build-up" season, spring time, when temperatures are the hottest and rainfall is starting but still relatively low. This is what makes conditions so good for mangos. It's the most unfavourable time for fungus and many of the insect pests prefer the relatively cooler weather further into the wet season (summer).

In temperate climates mangos tend to flower more into spring and fruit in summer.

As far as water/drainage goes, in the tropics mangos can stand in shallow water for 2 to 3 months, or in waterlogged ground for even longer. That happens during the wet season, summer. Of course, in the dry season, winter, the ground is parched dry, days are warm and nights cool. When fruiting they need some water otherwise you get too much fruit drop. But that water is best applied at ground level to keep humidity away from fruit (and flowers). And then too much water will cause fruit split. It's all very much a balancing act.